Re: How to enforce match priority irrespective of string position

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Re^2: How to enforce match priority irrespective of string position by LanX (Sage) on Mar 07, 2021 at 13:43 UTC
> `(?= .? $regex_1 ) .? $regex_1` does it make sense to repeat the regex? isn't it rather `(?= $re_cond_1 ) $re_match_1` ? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^3: How to enforce match priority irrespective of string position by rsFalse (Chaplain) on Mar 07, 2021 at 13:58 UTC
Of course, `'$re_cond_1'` may be not equal to `'$re_match_1'`. But I wanted to show the simplest example. Further `'\1'` can be used to avoid self-repeating.	[reply] [d/l] [select]
Re^4: How to enforce match priority irrespective of string position by LanX (Sage) on Mar 07, 2021 at 14:05 UTC
> Of course, `$re_cond_1` may be not equal to `$re_match_1` my point is, that it has IMHO no effect at all if it's identical. > But I wanted to show the simplest example too simple examples can confuse :) Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^5: How to enforce match priority irrespective of string position by Polyglot (Friar) on Mar 07, 2021 at 14:23 UTC
Re^5: How to enforce match priority irrespective of string position by rsFalse (Chaplain) on Mar 07, 2021 at 14:42 UTC
Re^3: How to enforce match priority irrespective of string position by Polyglot (Friar) on Mar 07, 2021 at 14:02 UTC
I must say that this syntax confuses me. I am already using a lookahead to define the forward edge of the match (versus where the next match will start in the global substitution), and everything up to but not including that lookahead needs to be captured. I've never thought one could capture from a lookahead...but perhaps I'd misunderstood. I'm also using backslash lookaround assertions, because some of what is matched will be matched again (these are the false positives) and for an unpredictable number of times (fewer than 20). I tried putting rsFalse's suggestion to use but was unable to get the match to succeed. I don't think I understand it well enough. Blessings, ~Polyglot~	[reply]
Re^4: How to enforce match priority irrespective of string position by LanX (Sage) on Mar 07, 2021 at 14:43 UTC
you can separate the "condition to match" (in the lookahead) from the actual match-pattern. Point is that a failed partial match might move the `pos` forward, but if the condition fails pos won't be changed before trying the next or-alternative. rsfalse might provide/link an example. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^5: How to enforce match priority irrespective of string position by rsFalse (Chaplain) on Mar 07, 2021 at 15:01 UTC
Re^6: How to enforce match priority irrespective of string position by LanX (Sage) on Mar 07, 2021 at 15:16 UTC
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Re^6: How to enforce match priority irrespective of string position by Polyglot (Friar) on Mar 07, 2021 at 23:23 UTC


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