Discussion

Re: positive lookbehind in JavaScript

Stevezilla00 — Thu, 17 May 2012 21:35:19 GMT

As noted, JavaScript does not support lookbehind. However, there is a short collection of functions at https://gist.github.com/2387872 that make it easy to emulate positive and negative lookbehind in JavaScript. (Note that the linked code relies on the XRegExp library.)

Re: positive lookbehind in JavaScript

mash — Thu, 04 Mar 2010 18:33:22 GMT

Please do not hijack someone else's post. Start a new Topic. Also it would be more appropriate to post this in the Regex Construction forum following the guidelines posted there.

Re: positive lookbehind in JavaScript

soneri — Thu, 04 Mar 2010 16:49:51 GMT

Hello,

I am trying to use regular expressions to scan a subdirectory structure and
run sfv and parity file checks on the directory. However, I am having an issue
with my current code using regular expressions to find par2 files. Multiple
par2 files are created for an archive in the following format:

test.par2
test.vol000+01.par2
test.vol000+03.par2
test.vol000+07.par2
and so on...

I only want to select the files name "test.par2" using regular expressions.

Re: positive lookbehind in JavaScript

unicorn — Tue, 23 Feb 2010 22:50:38 GMT

Hi people thank you for your replies about the code. This is so important that you have suggested this. I will also try it out because when I used this code before I also faced this type of problem. So I think now it is going to be solved.

Re: positive lookbehind in JavaScript

mash — Mon, 22 Feb 2010 15:34:16 GMT

buckman:
JavaScript is a language. it is used to make small scripts or designing. it does not provide any facility about graphical user interfaces to make GUI pages.

I don't know how that statement is relevant to the question asked by the original poster or this forum.

Re: positive lookbehind in JavaScript

buckman — Sat, 20 Feb 2010 10:55:40 GMT

JavaScript is a language. it is used to make small scripts or designing. it does not provide any facility about graphical user interfaces to make GUI pages.

Re: positive lookbehind in JavaScript

mash — Thu, 21 Jan 2010 16:33:07 GMT

The JavaScript regex engine does not support look-behinds

positive lookbehind in JavaScript

devMan — Thu, 21 Jan 2010 08:58:39 GMT

Hi,

I tried to do it this way:

Code:

var regex = new RegExp ("(?<= \ () [1-9 ](?=( and | or)) "," g ");

but I have an error:

invalid quantify ?<=()[ 1-9 ](?=( and | or))

thank you for helping me