Good day!
Can we think about removing not all but many restrictions of lookbehind
assertions?
If lookbehind of nonfixed length (?<=X) or (?<!X) happens at subject
position p, then pcre can do auxiliary match:
/(?:X)\z/ or /\A.*(?:X)\z/
subject[0;p-1] (part of subject from pos 0 to pos p-1)
Result of this auxiliary match may be result of lookbehind.
May be it not quite effective and still have restrictions but is useful.
Is it simple to add such functionality?
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