Comments on: Mimicking Lookbehind in JavaScript http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript A JavaScript and regular expression centric blog Thu, 09 Feb 2012 10:18:35 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: plumvelpeli http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript/comment-page-1#comment-151469 plumvelpeli Fri, 04 Nov 2011 18:33:22 +0000 http://blog.stevenlevithan.com/regular-expressions/mimic-lookbehind-javascript/#comment-151469 ???????? ? ??????????????? ??????????? "???? ???????? ? ??????????????????? ???????????? (??????????????) " ???????????? ??? ?????????????? ???? ????????. ????????? ????????????? ?? <b>????????? ?????????????? ?????????</b> ????? ???? ?????????? ????????? ?????????? ? ??????? ?????????????? ? ??????????? ??????????? ??????? ? ???????????, ???????????????? ?? ?????????? ??????. ???? ??????????? ? "??????????" ????????? ???????? ????? ????????? (Artem Avetisyan), ?????????? ????????????? ??????????? <b>???</b> - "????? ??????". ? ????????? ? ???????? ???????????? ?? "???????" ?????????? ??????, ?? ??????? ???????? ??????????? ???????? 50 ????????????. ?? ?????? ?????? ?????????, ?????? ?????????? ?????????? ?????????????? ? ???????? ??????, ? ????????? ????????? ?????? ? ???? ??????????? ?????????? ?? ????? 2011 ????. - ???, ??? ????????? ?? ????????? ?????????? - ??? ?????????????? ????<b>???</b>? ?? ??????????????, - ??????? ???????????? "?????? ???????". - ??????? ????????? ?????????? ?? ???????? ??????????? ??????????? ?? ?????? ????????? ??????? ?? ??????????? ???? ????? ????????. ?? ?? ????????????, ??? ?? ??????? ?? ?????? ????? ???????? ????????????? ?? ?????? ? ????. ??? ????? 70-80% ?????? ????? ??????. ? ????????? ????? <b>????????? ?????????????? ?????????</b> ????????? ?????????? ?????? ? ???????????????? (???), ????????? ??????????? ????????????? ??? ?????? ? ??????????. ????????????? ???????? ? ?????? ?????????????? ???????????? ?? ??????????????? ? ????????????? ??????????, ??????? ????????? ??? ?????? ?????????????? ? ?????????????? ??????-????????. ????? ??? ??????????? <b>???</b> 100 ??? ?????? ?? ??????????? ????????. ????? ????, ?????????? ????? <b>???</b> ? ?????????????? ????????????? ? ??, ??? ????????? ????? ???????? ????????? ???????? ??? ????????? ??????-??????? ?????????????? ?????????? ?? ???? ??????? - ????????????, ?????????? , ?????????????? ??????? <b>????????? ?????????????? ?????????</b>. ??????, ???????????? ????? ?????????, ??????? ? ???????????? ??????????????? ???????????? , ????? ???????????????? ??? ??????????? ? ??????? ???????. ?????????????? ?? ?????? ????? ??????? ??????????? ? ?????? ???????? ??? ???????? ???????? ??????? , ?? ?????????? ???????? ? ???? 10 ???????????. - ??? - ??? ???????? ????????, ??????? ????????? ?????? ?? ????, - ??????? ???????????? ??????????? "????? ??????". - ????????????? ??? ???? ??????????? ????? ??????? ?????? ????????????? ??????. ??? ??????????? ??????? ????????? ?????????, ????? ?????? ?????????????. ???????????? ? ??? ??????????????? ?????? ??????????? ???????????? ??????? ?????? ??? ??? ??????? ????????? ???????. ?? ?????? ????????? "?????? ???????" ?????? ?????????, ??? ????? ?????????? ??????????, ?????????????? ? ??????????, ????? ??????? ???????????? ????????, ????????? ?? <b>???</b>. ???? ??? ???????? ????????? ??????????????? ??????? ? ????? ?????????? ?????????? ? ????. ?????????????? ? <b>???</b> ????? ?? ?????? , ??? ???????????????, ??????????????? ??????????, ??????? ???????? ??????? ?? ????????? ?????????. <b>???</b> ?? ????????????? ?????????????? ? ?????????? ????????. ????????? ?????? ???? ??????????. ????????? ????????? ?????? ? ????????????? ????????????? ????? ?????????. ?? ????????????? ???????? ????????? ???, ??? ????? ?????????? ?????????? ????????? ? ????????????? ? ??????? - ?? ????? ??????????? ??????????? ?????????? ??????, ?? ????? ?????????? ??????. ? ????? ???????? ?????? ???????????? <b>???</b> - ???????? ??????????????? ? ?????????? ??? ????, ??????????????? ????????????? ??? ??????? ? ??????? ????? ???????? ??????? ????????????. ???????? ? ??????????????? ??????????? “???? ???????? ? ??????????????????? ???????????? (??????????????) ” ???????????? ??? ?????????????? ???? ????????. ????????? ????????????? ?? ????????? ?????????????? ????????? ????? ???? ?????????? ????????? ?????????? ? ??????? ?????????????? ? ??????????? ??????????? ??????? ? ???????????, ???????????????? ?? ?????????? ??????. ???? ??????????? ? “??????????” ????????? ???????? ????? ????????? (Artem Avetisyan), ?????????? ????????????? ??????????? ??? – “????? ??????”.
? ????????? ? ???????? ???????????? ?? “???????” ?????????? ??????, ?? ??????? ???????? ??????????? ???????? 50 ????????????. ?? ?????? ?????? ?????????, ?????? ?????????? ?????????? ?????????????? ? ???????? ??????, ? ????????? ????????? ?????? ? ???? ??????????? ?????????? ?? ????? 2011 ????.
- ???, ??? ????????? ?? ????????? ?????????? – ??? ?????????????? ???????? ?? ??????????????, – ??????? ???????????? “?????? ???????”.
- ??????? ????????? ?????????? ?? ???????? ??????????? ??????????? ?? ?????? ????????? ??????? ?? ??????????? ???? ????? ????????. ?? ?? ????????????, ??? ?? ??????? ?? ?????? ????? ???????? ????????????? ?? ?????? ? ????. ??? ????? 70-80% ?????? ????? ??????.
? ????????? ????? ????????? ?????????????? ????????? ????????? ?????????? ?????? ? ???????????????? (???), ????????? ??????????? ????????????? ??? ?????? ? ??????????. ????????????? ???????? ? ?????? ?????????????? ???????????? ?? ??????????????? ? ????????????? ??????????, ??????? ????????? ??? ?????? ?????????????? ? ?????????????? ??????-????????. ????? ??? ??????????? ??? 100 ??? ?????? ?? ??????????? ????????. ????? ????, ?????????? ????? ??? ? ?????????????? ????????????? ? ??, ??? ????????? ????? ???????? ????????? ???????? ??? ????????? ??????-??????? ?????????????? ?????????? ?? ???? ??????? – ????????????, ?????????? , ?????????????? ??????? ????????? ?????????????? ?????????. ??????, ???????????? ????? ?????????, ??????? ? ???????????? ??????????????? ???????????? , ????? ???????????????? ??? ??????????? ? ??????? ???????. ?????????????? ?? ?????? ????? ??????? ??????????? ? ?????? ???????? ??? ???????? ???????? ??????? , ?? ?????????? ???????? ? ???? 10 ???????????. – ??? – ??? ???????? ????????, ??????? ????????? ?????? ?? ????, – ??????? ???????????? ??????????? “????? ??????”.
- ????????????? ??? ???? ??????????? ????? ??????? ?????? ????????????? ??????. ??? ??????????? ??????? ????????? ?????????, ????? ?????? ?????????????. ???????????? ? ??? ??????????????? ?????? ??????????? ???????????? ??????? ?????? ??? ??? ??????? ????????? ???????. ?? ?????? ????????? “?????? ???????” ?????? ?????????, ??? ????? ?????????? ??????????, ?????????????? ? ??????????, ????? ??????? ???????????? ????????, ????????? ?? ???. ???? ??? ???????? ????????? ??????????????? ??????? ? ????? ?????????? ?????????? ? ????. ?????????????? ? ??? ????? ?? ?????? , ??? ???????????????, ??????????????? ??????????, ??????? ???????? ??????? ?? ????????? ?????????.
??? ?? ????????????? ?????????????? ? ?????????? ????????. ????????? ?????? ???? ??????????. ????????? ????????? ?????? ? ????????????? ????????????? ????? ?????????. ?? ????????????? ???????? ????????? ???, ??? ????? ?????????? ?????????? ????????? ? ????????????? ? ??????? – ?? ????? ??????????? ??????????? ?????????? ??????, ?? ????? ?????????? ??????. ? ????? ???????? ?????? ???????????? ??? – ???????? ??????????????? ? ?????????? ??? ????, ??????????????? ????????????? ??? ??????? ? ??????? ????? ???????? ??????? ????????????.

]]> By: David http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript/comment-page-1#comment-137884 David Fri, 23 Sep 2011 08:47:27 +0000 http://blog.stevenlevithan.com/regular-expressions/mimic-lookbehind-javascript/#comment-137884 Also in the 3rd method, 'regex.x.gRegex' should NOT be an exact copy of 'regex'. 'regex.x.gRegex' should be the intended regex, including any any lookAHEADS. 'regex' should be a copy of 'regex.x.gRegex' except that any positive lookaheads whose values won't be in a match of 'regex.x.gRegex' (e.g., any trailing lookahead) should be excluded. Otherwise the match[0].replace(regex, replacement) call will fail because 'regex' includes a positive lookahead but the characters that lead to the match aren't included in match[0]. Also in the 3rd method, ‘regex.x.gRegex’ should NOT be an exact copy of ‘regex’. ‘regex.x.gRegex’ should be the intended regex, including any any lookAHEADS. ‘regex’ should be a copy of ‘regex.x.gRegex’ except that any positive lookaheads whose values won’t be in a match of ‘regex.x.gRegex’ (e.g., any trailing lookahead) should be excluded. Otherwise the match[0].replace(regex, replacement) call will fail because ‘regex’ includes a positive lookahead but the characters that lead to the match aren’t included in match[0].

]]> By: David http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript/comment-page-1#comment-137877 David Fri, 23 Sep 2011 08:22:42 +0000 http://blog.stevenlevithan.com/regular-expressions/mimic-lookbehind-javascript/#comment-137877 I think the first line in the else branch of the while loop in the 3rd method needs to be changed from output += match[0].charAt(0) to output += data.substring(lastLastIndex, match.index) + match[0].charAt(0) Otherwise, if the regex.x.gRegex.exec(data) consumes multiple characters via non-matches, those characters won't be included in the output. I think the first line in the else branch of the while loop in the 3rd method needs to be changed from

output += match[0].charAt(0)

to

output += data.substring(lastLastIndex, match.index) + match[0].charAt(0)

Otherwise, if the regex.x.gRegex.exec(data) consumes multiple characters via non-matches, those characters won’t be included in the output.

]]> By: javascript regex – look behind alternative? http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript/comment-page-1#comment-136560 javascript regex – look behind alternative? Sun, 18 Sep 2011 10:48:20 +0000 http://blog.stevenlevithan.com/regular-expressions/mimic-lookbehind-javascript/#comment-136560 [...] Here are some thoughts, but needs helper functions. I was hoping to achieve it just with a regex: http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript [...] [...] Here are some thoughts, but needs helper functions. I was hoping to achieve it just with a regex: http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript [...]

]]> By: Dave http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript/comment-page-1#comment-133999 Dave Thu, 08 Sep 2011 13:19:59 +0000 http://blog.stevenlevithan.com/regular-expressions/mimic-lookbehind-javascript/#comment-133999 What would be useful would be to provide the equivalent of \b(\w+)\b for getting all words in document for unicode. Xregex provides \p{L} for matching unicode characters and \P{L} as the negation so it should be possible to do something like the following /(?<=\P{L})(\p{L}+)(?=\P{L})/ to get all unicode words What would be useful would be to provide the equivalent of \b(\w+)\b for getting all words in document for unicode. Xregex provides \p{L} for matching unicode characters and \P{L} as the negation so it should be possible to do something like the following

/(?<=\P{L})(\p{L}+)(?=\P{L})/

to get all unicode words

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