Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.javascript > #40877

Re: trying to match a "word", having difficulty with a "Lookbehind assertion"

Show all headers | View raw

JJ,

> Look-behind is used to match patternA which follows or not follows
> patternB, and does not include patternB in the match result.

Yeah, I read that too :

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Assertions

> Your condition is to simply to match "g**d***". You do not have a 
> condition
> that, "g**d***" must follow or must not follow other pattern.

Whut ?   What do you think my 'RegExp(...)' is about than ?

Maybe a bit more code will help :

'- - - - - - - - - - - - - - - - - -

function escapeRegExp(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the 
whole matched string
}

function replaceAll(str, find, replace) {
  return str.replace(new RegExp("(?<=[^a-zA-Z\*])" + escapeRegExp(find) + 
"(?=[^a-zA-Z\*])",'gi'), replace);;
}


newString = oldString.replaceAll("g**d***","goddamn")

'- - - - - - - - - - - - - - - - - -

My own contribution to the above are just the "(?....)" parts.  The latter 
one works, the former doesn't.


But, I think I found why it doesn't work : I just found out that my FF v52 
already throws an "invalid regexp group" error on something simple as 
oldString.replace(/(?<=p)a/g, "!");

No idea why though - and thus no idea what to replace it with either.

Regards,
Rudy Wieser

Back to comp.lang.javascript | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-05-21 11:20 +0200
  Re: trying to match a "word", having difficulty with a "Lookbehind assertion" The Natural Philosopher <tnp@invalid.invalid> - 2022-05-21 11:17 +0100
    Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-05-22 13:42 +0200
      Re: trying to match a "word", having difficulty with a "Lookbehind assertion" The Natural Philosopher <tnp@invalid.invalid> - 2022-05-22 13:03 +0100
        Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-05-22 17:42 +0200
          Re: trying to match a "word", having difficulty with a "Lookbehind assertion" The Natural Philosopher <tnp@invalid.invalid> - 2022-05-23 13:57 +0100
  Re: trying to match a "word", having difficulty with a "Lookbehind assertion" JJ <jj4public@gmx.com> - 2022-05-21 19:13 +0700
    Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-05-21 16:33 +0200
    Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-05-21 19:45 +0200
    Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-06-09 00:14 +0200
      Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-06-09 09:16 +0200
      Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-06-09 12:21 +0200
  Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Scott Sauyet <scott@sauyet.com> - 2022-06-14 10:56 -0700
    Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-06-15 09:47 +0200
      Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Scott Sauyet <scott@sauyet.com> - 2022-06-15 12:42 -0700
        Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-06-15 22:15 +0200
          Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Scott Sauyet <scott@sauyet.com> - 2022-06-15 13:32 -0700
            Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-06-16 09:16 +0200
              Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Scott Sauyet <scott@sauyet.com> - 2022-06-16 10:33 -0700
                Re: trying to match a "word", having difficulty with a "Lookbehind assertion" "R.Wieser" <address@not.available> - 2022-06-16 21:18 +0200
                Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Scott Sauyet <scott@sauyet.com> - 2022-06-17 09:56 -0700
  Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Кристьян Робам <ingel1983912@gmail.com> - 2022-06-16 23:34 -0700
  Re: trying to match a "word", having difficulty with a "Lookbehind assertion" Härra Rabmo <ingel1983912@gmail.com> - 2022-07-06 09:13 -0700

csiph-web