Re: Did regex match fail because of "end of string"?

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Re^2: Did regex match fail because of "end of string"? by ikegami (Patriarch) on Oct 16, 2007 at 20:03 UTC
I believe the OP wants to know if there was a time when the engine reached the end of the string after starting a match. For `/a\d+b/`, `"a123b\n" -> match "a123\n" -> incomplete match "a123c\n" -> no match` [download]	[reply] [d/l] [select]
Re^3: Did regex match fail because of "end of string"? by roboticus (Chancellor) on Oct 16, 2007 at 20:21 UTC
ikegami: Ah! That interpretation certainly makes sense. (I found it hard to reconcile my interpretation of the question with moritz' experience.) ...roboticus	[reply]
Re^2: Did regex match fail because of "end of string"? by Joost (Canon) on Oct 16, 2007 at 20:02 UTC
If the regex is anchored to the beginning of the string, it could fail without reaching the end. Otherwise, as far as I can imagine it would have to match every available substring* up to the end of the string. * if the match is at least N characters long the match will fail if any of the (last - N) .. last characters of the string don't match and the subsequent characters don't have to be tested. Anyway this is equivalent to running into the end of string. "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply]
Re^3: Did regex match fail because of "end of string"? by moritz (Cardinal) on Oct 16, 2007 at 20:09 UTC
Right, all matches in the tokenizer will be anchored to pos with `\G`.	[reply] [d/l]
Re^4: Did regex match fail because of "end of string"? by Joost (Canon) on Oct 16, 2007 at 20:33 UTC
Well, your regex will either match or it won't. And since \G is part of the regex, it will always "fail during a match". I think I understand what you're trying to do, but I don't think there really is a way to put your question in a general form that the regex engine will understand. "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply]