JavaScript? Putting a variable in the midst of a Regular Expression.

[Garrett_Cobarr@adobeforums.com]

I was reading a great article by Kas Thomas, "Save Yourself Some Typing with 'With'" at PlanetPDF. I really don't care much for the term guru, I think it is way overused, but if anyone deserved it, it would be him. Really great informative JavaScript info and he is funny too.

He had this script chunk below and it was very close to something I am doing. Although, how I was going about it was much less elegant so I wanted to adapt his example to what I was trying to accomplish.

var subtotal = 0.0;
var fld;

with (this) { // default object is 'this'

for (var k = numFields; k; k--)
{

fld = getField(getNthFieldName(k-1));
if (fld.name.match(/amt/i))
subtotal += fld.value;

}
}

Although the article is about using the 'with' statement to conserve and compact your code what caught my eye was this very elegant loop for iterating through a number of fields, a very common need.

But what has stopped me is that his example... (fld.name.match(/amt/i)) is a fixed match for a known word, in this case, any occurence of 'amt'. I need to have a variable in the middle of the same RegEx because my search is arbitrary, I do not know what the word value will be, but I have not seen an example of this anywhere.

Does anyone know how this bit of syntax gymnastics might be accomplished?

[Graham_O_Connor@adobeforums.com]

Try this for the if statement:

if (util.printx("<*",fld.name).match(reqstrvar))

where reqstrvar is the variable containing the required string.

[Garrett_Cobarr@adobeforums.com]

Graham, thanks! I just stumbled on your answer, the forum is acting up and not sending out subscriptions.

Here is a link to George's response on Planet PDF...
<http://forum.planetpdf.com/webboard/wbpx.dll/~planetpdfforum>