Regular expression help

John · John

Hi,

I'm pretty new to regular expressions. Before, I used to write long-winded
and buggy segments of code with PHPs string functions to extract text. But I
want to learn how to use perl reg-ex as it seems useful to know so I ordered
"Mastering Regular Expressions". But it hasn't come yet so I'm asking for
help...

I need to match a pattern, not in a single-line but from a HTML page, which
obviously has loads of lines. I need to match 2 lines from this HTML page:
1) <HTML><TITLE>FirstVariable - Second Variable</TITLE></HTML>........
2) <TABLE><TD><TR>(newline)
ThirdVariable</TR></TD></TABLE>...

I tried this code:
1) preg_match("/<HTML><TITLE>(\S+) - (\S+)</TITLE></HTML>/", $html_page,
$variables);
2) preg_match("/<TABLE><TD><TR>\n(\S+)</TR></TD></TABLE>/", $html_page,
$variables);

The first 2 variables are matched into the $variables array but not the
third one. Sometimes when the third one is matched, it starts from where I
want it to start but takes all the text to the end of the HTML document!

Any ideas? Is there any characters that I should have escaped that I
didn't?? All I can think of is that because the first line that I want to
match is on the FIRST LINE of the html page, that matches. But reg-ex can't
handle the next line as its way down the page????

TIA

Greg Bacon · Greg Bacon

In article <d216aa8d.0307171157.5e63c194@posting.google.com >,
Joseph <joseph.vanquakebeke@ngc.com> wrote:

: I am having trouble with a regular expression not working the way I
: expect it to. My code:
:
: [reformatted]
: if (/^\s*|^\s*$/) {
: if (DEBUG) {
: print " ",
: "comment line pattern single line : \n",
: "\n$_";
: }
: # match a multi-line comment that spans 1 or lines.
: $count++;
: next;
: }
:
: [snip output]

In general with Usenet questions, it's almost always better to give a
complete -- but BRIEF! -- example. The less effort people have to
expend in understanding your post, the more likely you are to get good
answers.

Where did the blank line pattern come from?

: where are the lines with more than one word. I really do not want to
: have write a seperate expression for 1 .. N words. I thought the
: asterisk was supposed to be greedy. I have tried the + but it has the
: same effect.

You could write your pattern as

if (/^\s*$/) {
...
}

This will look for alternating runs of any length of either whitespace
or word characters within your comments.

IMPORTANT: this regular expression will not correctly recognize all XML
comments and could yield false positives. If you want to parse XML, use
an XML parser. :-)

: Can someone explain why this is not working? I think I can fix this
: if I try to use a character class but I am not sure. I am still
: reading the camel book to find out.

The Kleene star has a greedy in perl's regular expression matcher, but
you're anchoring your match, with a possibility for at most two runs of
word characters.

Consider the following comment:



The matcher will try your first alternative (^\s*), but
will only get as far as indicated:

substring subpattern
========= ==========
BEGIN ^
SPACES \s*
 FAIL!

Then it'll try the other alternative (^\s*$):

substring subpattern
========= ==========
BEGIN ^
SPACES \s*
 FAIL!

With the pattern I gave (/^\s*$/), it'll match:

substring subpattern
========= ==========
BEGIN ^
SPACES \s*
 -->
END $

Hope this helps,
Greg
--
The whole aim of practical politics is to keep the populace alarmed -- and
thus clamorous to be led to safety -- by menacing it with an endless
series of hobgoblins, all of them imaginary.
-- H.L. Mencken

Jorell · Jorell

Hi everyone. I have never worked with regular expressions
before and here is my dillema:

I have a textbox that I want to only accept this type of
input:

1,2,3-8,10,16 ( Comma separated numbers or Hyphenated
ranges )

I want to use a validator for this, so I assume I use a
regularexpressionvalidator?? If so any help on what I
would write for a regular expression?? Thank you

Jorell

Chris Jackson · Chris Jackson

Well, you can interrogate it on a number of levels - it really depends on
how thoroughly you want to make your validation.

I mean, you could validate the characters themselves:

^[0-9\-,]*$

What this means: you will have zero or more of the characters 0 through 9, a
dash, or a comma. This would filter out any other character, however, you
would then approve the string ,-,,-,,-9-,,

If you want to get a little bit closer, here is a better regex:

^([0-9]+(\-[0-9]+)*,*)+$

Now, you are required to have one or more numbers, followed by zero or more
instances of a dash followed by one or more numbers, followed by zero or
more instances of a comma - this entire sequence being repeated one or more
times.

Now, you will match 1,2-9,13. You also guarantee that you will get at least
one number put in. However, this doesn't prevent you from putting in 9-2,
which may throw your parser off. It will also validate 0-2-4.

So, you have to sit and play with exactly what you will allow, and gradually
keep expanding what you are doing until you have a great validation in place
that covers every instance that you can come up with.

If your parser is very particular about how the input comes in, then you may
want to write a custom validator in code.

--
Chris Jackson
Software Engineer
Microsoft MVP - Windows XP
Windows XP Associate Expert
--
"Jorell" <zwarichj@nospam.powervisionsw.com> wrote in message
news:028301c3552b$a0ff81c0$a101280a@phx.gbl...

> Hi everyone. I have never worked with regular expressions
> before and here is my dillema:
>
> I have a textbox that I want to only accept this type of
> input:
>
> 1,2,3-8,10,16 ( Comma separated numbers or Hyphenated
> ranges )
>
> I want to use a validator for this, so I assume I use a
> regularexpressionvalidator?? If so any help on what I
> would write for a regular expression?? Thank you
>
>
> Jorell

Jorell · Jorell

Thank you very much!!! Do you happen to know where a
person can learn a little more about creating those??
Thanks in advance!!

Jorell

>-----Original Message-----
>Well, you can interrogate it on a number of levels - it

really depends on

>how thoroughly you want to make your validation.
>
>I mean, you could validate the characters themselves:
>
>^[0-9\-,]*$
>
>What this means: you will have zero or more of the

characters 0 through 9, a

>dash, or a comma. This would filter out any other

character, however, you

>would then approve the string ,-,,-,,-9-,,
>
>If you want to get a little bit closer, here is a better

regex:

>
>^([0-9]+(\-[0-9]+)*,*)+$
>
>Now, you are required to have one or more numbers,

followed by zero or more

>instances of a dash followed by one or more numbers,

followed by zero or

>more instances of a comma - this entire sequence being

repeated one or more

>times.
>
>Now, you will match 1,2-9,13. You also guarantee that you

will get at least

>one number put in. However, this doesn't prevent you from

putting in 9-2,

>which may throw your parser off. It will also validate 0-

2-4.

>
>So, you have to sit and play with exactly what you will

allow, and gradually

>keep expanding what you are doing until you have a great

validation in place

>that covers every instance that you can come up with.
>
>If your parser is very particular about how the input

comes in, then you may

>want to write a custom validator in code.
>
>--
>Chris Jackson
>Software Engineer
>Microsoft MVP - Windows XP
>Windows XP Associate Expert
>--
>"Jorell" <zwarichj@nospam.powervisionsw.com> wrote in

message

>news:028301c3552b$a0ff81c0$a101280a@phx.gbl...

>> Hi everyone. I have never worked with regular

expressions

>> before and here is my dillema:
>>
>> I have a textbox that I want to only accept this type of
>> input:
>>
>> 1,2,3-8,10,16 ( Comma separated numbers or Hyphenated
>> ranges )
>>
>> I want to use a validator for this, so I assume I use a
>> regularexpressionvalidator?? If so any help on what I
>> would write for a regular expression?? Thank you
>>
>>
>> Jorell

>
>
>.
>

William F. Robertson, Jr. · William F. Robertson, Jr.

Here are a couple articles to help you get going.

Look closely at the EvaluationFunction attribute and the EvaluateIsValid
method (or function)

[url]http://www.codeproject.com/useritems/DateValidator.asp[/url]

[url]http://www.c-sharpcorner.com/Code/2002/May/DateCustomValidator.asp[/url]

HTH,

bill

"Jorell" <zwaricgj@nospam.powervisionsw.com> wrote in message
news:029e01c35541$2d4a5ff0$a401280a@phx.gbl...

> Thank you very much!!! Do you happen to know where a
> person can learn a little more about creating those??
> Thanks in advance!!
>
> Jorell
>
>

> >-----Original Message-----
> >Well, you can interrogate it on a number of levels - it

> really depends on

> >how thoroughly you want to make your validation.
> >
> >I mean, you could validate the characters themselves:
> >
> >^[0-9\-,]*$
> >
> >What this means: you will have zero or more of the

> characters 0 through 9, a

> >dash, or a comma. This would filter out any other

> character, however, you

> >would then approve the string ,-,,-,,-9-,,
> >
> >If you want to get a little bit closer, here is a better

> regex:

> >
> >^([0-9]+(\-[0-9]+)*,*)+$
> >
> >Now, you are required to have one or more numbers,

> followed by zero or more

> >instances of a dash followed by one or more numbers,

> followed by zero or

> >more instances of a comma - this entire sequence being

> repeated one or more

> >times.
> >
> >Now, you will match 1,2-9,13. You also guarantee that you

> will get at least

> >one number put in. However, this doesn't prevent you from

> putting in 9-2,

> >which may throw your parser off. It will also validate 0-

> 2-4.

> >
> >So, you have to sit and play with exactly what you will

> allow, and gradually

> >keep expanding what you are doing until you have a great

> validation in place

> >that covers every instance that you can come up with.
> >
> >If your parser is very particular about how the input

> comes in, then you may

> >want to write a custom validator in code.
> >
> >--
> >Chris Jackson
> >Software Engineer
> >Microsoft MVP - Windows XP
> >Windows XP Associate Expert
> >--
> >"Jorell" <zwarichj@nospam.powervisionsw.com> wrote in

> message

> >news:028301c3552b$a0ff81c0$a101280a@phx.gbl...

> >> Hi everyone. I have never worked with regular

> expressions

> >> before and here is my dillema:
> >>
> >> I have a textbox that I want to only accept this type of
> >> input:
> >>
> >> 1,2,3-8,10,16 ( Comma separated numbers or Hyphenated
> >> ranges )
> >>
> >> I want to use a validator for this, so I assume I use a
> >> regularexpressionvalidator?? If so any help on what I
> >> would write for a regular expression?? Thank you
> >>
> >>
> >> Jorell

> >
> >
> >.
> >

Eurospace Szarindar · Eurospace Szarindar

Hi,

I tried to write a script to extrat data from the given DATA but I can find
the right regular expression to do that.
RULE: I need to catch everything between quotes (single or double) and if
inside exists a repeated quote (single or double) it is not seen as end of
the match.

#!/usr/bin/perl -w

use strict;

my $begin = '[\",\']'; #
my $end = '[\",\']'; #
my $pattern = "${begin}(.*?)${end}"

while (<DATA>) {
print "line content $_ \n"
while ( /$pattern/g ){
print "line $. found : $1\n"
}

}

__DATA__
' data11 '' data12' 'data13'
" data21 "" data22" "data23"
" data31 '' data32" "" "data34"
"data41" "data42" "data43" "__--data44"
"""" "''" '""' ''''

Result should be
1:( data11 '' data12)
2:(data13)
3:( data21 "" data22)
4:(data23)
5:(data31 '' data32)
6:()
7:(data34)
8:(data41)
9:(data42)
10:(data43)
11:(__--data44)
12:("")
13:('')
14:("")
15:('')

It could be resolved by replacing the \"{2} or \'{2} by a "~@~" and
alterwards relacing it back to the previous value but it is not very smart.

great thanks in advance

Michel

Eurospace Szarindar · Eurospace Szarindar

Thanks you, it works fine. Could you explain me why have you added the \1 ?
I will have a look at Text::CSV

Michel

-----Message d'origine-----
De: Rob Anderson [mailto:rjanderson@uk2.net]
Date: lundi 18 août 2003 16:39
À: [email]beginners@perl.org[/email]
Objet: Re: Regular expression help

"Eurospace Szarindar" <EUROSPACE.SZARINDAR@launchers.eads.net> wrote in
message news:F3174A44D16DE7478BEFD32644C5C7D601A5D018@mspc 5748.bs.as....

> Hi,
>
> I tried to write a script to extrat data from the given DATA but I can

find

> the right regular expression to do that.

Hi Szarindar,

Firstly why are you using this format and trying to parse it yourself? If
you've got control of your data, use something like Text::CSV. The guy who
maintains your code will thank you for it.

otherwise, this seems to work (you'll have to print with $2 though)....

/(['"])(((''|"")|[^'"])*?)\1(\s|$)/g

HTH

Rob Anderson

> RULE: I need to catch everything between quotes (single or double) and if
> inside exists a repeated quote (single or double) it is not seen asend of
> the match.
>
> #!/usr/bin/perl -w
>
> use strict;
>
> my $begin = '[\",\']'; #
> my $end = '[\",\']'; #
> my $pattern = "${begin}(.*?)${end}"
>
> while (<DATA>) {
> print "line content $_ \n"
> while ( /$pattern/g ){
> print "line $. found : $1\n"
> }
>
> }
>
>
> __DATA__
> ' data11 '' data12' 'data13'
> " data21 "" data22" "data23"
> " data31 '' data32" "" "data34"
> "data41" "data42" "data43" "__--data44"
> """" "''" '""' ''''
>
>
>
> Result should be
> 1:( data11 '' data12)
> 2:(data13)
> 3:( data21 "" data22)
> 4:(data23)
> 5:(data31 '' data32)
> 6:()
> 7:(data34)
> 8:(data41)
> 9:(data42)
> 10:(data43)
> 11:(__--data44)
> 12:("")
> 13:('')
> 14:("")
> 15:('')
>
>
> It could be resolved by replacing the \"{2} or \'{2} by a "~@~" and
> alterwards relacing it back to the previous value but it is not very

smart.

>
>
>
> great thanks in advance
>
> Michel

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Rob Anderson · Rob Anderson

>

>"Eurospace Szarindar" <EUROSPACE.SZARINDAR@launchers.eads.net> wrote in

message >news:F3174A44D16DE7478BEFD32644C5C7D601A5D01C@msp c5748.bs.as...

>
>Thanks you, it works fine. Could you explain me why have you added the \1 ?

Hi,

A quick breakdown...

/(['"])(((''|"")|[^'"])*?)\1(\s|$)/g
^^^^^^
1 ^^^^^^^^^^^^^^^^
2
^^
3

1) This is picking up either a single or double quote

2) This is scoping up any quotes pairs, and is being carefull not
to match quotes on thier own.

3) In a regex \1, \2 etc.. will match the same sequence of characters
matched
earlier in the same-numbered pair of parentheses, in this case, it means
that were making sure the opening and closing quotes are the same by
mathching
that same character as in part 1.

Explaining it like this has made me spot a problem. The regex you really
want is

m/(['"])(((''|"")|[^\1])*?)\1(\s|$)/g

This way our 'scoping up' part matches any paired quotes or anything other
than
our closing quote.

The following test data wouldn't have worked...

' data11 '' dat"a12' 'data13'

>
>I will have a look at Text::CSV
>

Please do, my mistake above shows you why you shouldn't reinvent this stuff
if you can
get away with it. :-)

Ta

Rob

>
>Michel
>
>-----Message d'origine-----
>De: Rob Anderson [mailto:rjanderson@uk2.net]

Saya · Saya

Hi,
here is the scenario:

I have a variable containing the following:
<table cellpadding="0" cellspacing="0">
<tr>
<td class="footer">Ottiliavej 9</td>
<td class="footer">telefon 092323</td></tr>
<tr><td class="footer">DK-2500 Valby</td>
<td class="footer">fax 092323</td>
</tr>
</table>

A regular expression that gives me the text(sometext) between the <td
....>sometext</td>
tags ?
I have tried all of my own knowledge og regular expression (which by
the way is very little). Any help will be appeciated.

Thx
Saya

Abigail · Abigail

Saya (vahu@novonordisk.com) wrote on MMMDCXXXIX September MCMXCIII in
<URL:news:9e9517bf.0308181124.19a9c3d5@posting.goo gle.com>:
^^ Hi,
^^ here is the scenario:
^^
^^ I have a variable containing the following:
^^ <table cellpadding="0" cellspacing="0">
^^ <tr>
^^ <td class="footer">Ottiliavej 9</td>
^^ <td class="footer">telefon 092323</td></tr>
^^ <tr><td class="footer">DK-2500 Valby</td>
^^ <td class="footer">fax 092323</td>
^^ </tr>
^^ </table>
^^
^^ A regular expression that gives me the text(sometext) between the <td
^^ ...>sometext</td>
^^ tags ?
^^ I have tried all of my own knowledge og regular expression (which by
^^ the way is very little). Any help will be appeciated.

#!/usr/bin/perl

use strict;
use warnings;

use Regexp::Common;

$_ = <<'--';
<table cellpadding="0" cellspacing="0">
<tr>
<td class="footer">Ottiliavej 9</td>
<td class="footer">telefon 092323</td></tr>
<tr><td class="footer">DK-2500 Valby</td>
<td class="footer">fax 092323</td>
</tr>
</table>
--

while (m!$RE{balanced}{-begin => '<td'}{-end => '</td>'}{-keep}!g) {
print "$1\n";
}
__END__
<td class="footer">Ottiliavej 9</td>
<td class="footer">telefon 092323</td>
<td class="footer">DK-2500 Valby</td>
<td class="footer">fax 092323</td>

This will take of nested elements as well. However, it won't deal
with cases like:

<td><img src = 'foo.gif' alt = '</td>'></td>

Abigail
--
perl -wle'print"Êõóô*áîïôèåò*Ðåòì*Èáãëåò"^"\x80"x24'

Vlad Tepes · Vlad Tepes

Saya <vahu@novonordisk.com> wrote:

> Hi,
> here is the scenario:
>
> I have a variable containing the following:
> <table cellpadding="0" cellspacing="0">
> <tr>
> <td class="footer">Ottiliavej 9</td>
> <td class="footer">telefon 092323</td></tr>
> <tr><td class="footer">DK-2500 Valby</td>
> <td class="footer">fax 092323</td>
> </tr>
> </table>
>
> A regular expression that gives me the text(sometext) between the <td
> ...>sometext</td>
> tags ?
> I have tried all of my own knowledge og regular expression (which by
> the way is very little). Any help will be appeciated.

Here is one way (assuming the html is stored in $html):

my @tds = $html =~ m#<td class="footer">(.*)</td>#g;

( Matching (=~) has higher precedence than assignment (=), so
the list of captured items by matching $html against the regex
is put into the array @tds. )

To handle cells with newlines, for example

<td class="footer">telefon
092323</td></tr>

you could make the period match newlines (add the modifier 's'), and
then use minimal matching (a questionmark after the quantifier makes it
eat as few characters as possible, ie. find the first '</td>' instead of
the last) thus:

my @tds = $html =~ m#<td class="footer">(.*?)</td>#sg;

Some references:

perldoc perlrequick (gentle intro to regexes)
perldoc perlre (the full story)
perldoc -q html (search faqs for html,
could be of interest)

--
Vlad

Eurospace Szarindar · Eurospace Szarindar

Hi Rob,

You are totally right your exemple (' data11 '' dat"a12' 'data13') should
raise an error and this is normal. I will nethertheless look carefully for
the Text::CSV module.

Thanks

Michel

-----Message d'origine-----
De: Rob Anderson [mailto:rjanderson@uk2.net]
Date: lundi 18 août 2003 17:34
À: [email]beginners@perl.org[/email]
Objet: Re: Regular expression help

>
>"Eurospace Szarindar" <EUROSPACE.SZARINDAR@launchers.eads.net> wrotein

message >news:F3174A44D16DE7478BEFD32644C5C7D601A5D01C@msp c5748.bs.as....

>
>Thanks you, it works fine. Could you explain me why have you added the \1 ?

Hi,

A quick breakdown...

/(['"])(((''|"")|[^'"])*?)\1(\s|$)/g
^^^^^^
1 ^^^^^^^^^^^^^^^^
2
^^
3

1) This is picking up either a single or double quote

2) This is scoping up any quotes pairs, and is being carefull not
to match quotes on thier own.

3) In a regex \1, \2 etc.. will match the same sequence of characters
matched
earlier in the same-numbered pair of parentheses, in this case, itmeans
that were making sure the opening and closing quotes are the same by
mathching
that same character as in part 1.

Explaining it like this has made me spot a problem. The regex you really
want is

m/(['"])(((''|"")|[^\1])*?)\1(\s|$)/g

This way our 'scoping up' part matches any paired quotes or anything other
than
our closing quote.

The following test data wouldn't have worked...

' data11 '' dat"a12' 'data13'

>
>I will have a look at Text::CSV
>

Please do, my mistake above shows you why you shouldn't reinvent thisstuff
if you can
get away with it. :-)

Ta

Rob

>
>Michel
>
>-----Message d'origine-----
>De: Rob Anderson [mailto:rjanderson@uk2.net]

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Jamie · Jamie

Hi, i've been trying to create a regex to do the following.
Ive got scripts which enter japanese and chinese into a database. A
part of this involves them entering furigana style inputs using a
simplified tag system.

{R:chacaters, furgana}
do regex to translate into

<RUBY><RB>$1</RB><RT>$2</RT></RUBY>

$temp = preg_replace("/({R:)(.*)(,)(.*)(})/",
"<RUBY><RB>$2</RB><RT>$4</RT></RUBY>", $source);

That is what i came up with, but it's too greedy. If i have more than
1 encoded set, it just grabs the longest match it can find. I'm newish
to this regex syuff.

Thanks

J

Jamie
[email]jamien@interworx.com.au[/email]

John Dunlop · John Dunlop

Jamie wrote:

> That is what i came up with, but it's too greedy.

You may invert the greediness of quantifiers using question marks:

`(a.*?b)`

Or, set the U pattern modifier, which inverts the greediness of
all quantifiers:

`(a.*b)`U

Or, invert the greediness internally:

`((?U)a.*b)`

The regular expressions above are semantically identical. All of
them capture a letter "a" followed by anything (except newlines,
by default) until the first occurrence of a letter "b".

--
Jock

Jamie · Jamie

On Mon, 6 Oct 2003 16:28:31 +0100, John Dunlop
<john+usenet@johndunlop.info> wrote:

>Jamie wrote:
>

>> That is what i came up with, but it's too greedy.

>
>You may invert the greediness of quantifiers using question marks:
>
>`(a.*?b)`
>
>Or, set the U pattern modifier, which inverts the greediness of
>all quantifiers:
>
>`(a.*b)`U
>
>Or, invert the greediness internally:
>
>`((?U)a.*b)`
>
>The regular expressions above are semantically identical. All of
>them capture a letter "a" followed by anything (except newlines,
>by default) until the first occurrence of a letter "b".

Hi Thanks!
I've almost got it now:

preg_replace("/({R:)(.*?,)(.*?})/",
"<RUBY><RB>$2</RB><RT>$3</RT></RUBY>", $temp);

But, i can't get it quite right (easliy that is). This captures
everything up to and including the , and } So how do i capture
everything upto but not including?
Right now, i can kind of strip the commas and curlies from the text,
but this won't work for the large block text bits.

Thanks
Jamie :-)

Jamie
[email]jamien@interworx.com.au[/email]

John Dunlop · John Dunlop

Jamie wrote:

> preg_replace("/({R:)(.*?,)(.*?})/",
> "<RUBY><RB>$2</RB><RT>$3</RT></RUBY>", $temp);
>
> But, i can't get it quite right (easliy that is). This captures
> everything up to and including the , and } So how do i capture
> everything upto but not including?

Place the characters you don't want captured outside the
subpatterns' parentheses. Giving you:

$temp = preg_replace(
'`{R:(.*?),(.*?)}`',
'<RUBY><RB>$1</RB><RT>$2</RT></RUBY>',
$temp)

> Right now, i can kind of strip the commas and curlies from the
> text, but this won't work for the large block text bits.

The dot metacharacter doesn't match newlines by default. Thus, if
the text spans multiple lines, it won't match. If the s pattern
modifier (PCRE_DOTALL) is set, the dot matches newlines too.

[url]http://www.php.net/manual/en/pcre.pattern.modifiers.php[/url]

--
Jock

wiseduck · wiseduck

Does anyone know of a simple way that I could convert the following using a
regular expression???

CONVERT THIS:

<item>
<title>Some link title</title>
<description>description text here</description>
<link>http://www.example.com</link>
</item>

INTO THIS:

<li>
<div class="t"><a href="http://www.example.com">Some link title</a></div>
<span class="d">description text here</span>
</li>

OR VICE VERSA.

mattw · mattw

Looks like an XML document to me. I haven't used them myself, but do some
research on XMLParse and all the other XML functions. That would probably be a
better solution in the long run than using regular expressions.

MW

mrampson · mrampson

Check out XmlTransform() and XSLT (I'm assuming this is an xml document).

Mike

Regular expression help

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