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pcre - What's the technical reason for "lookbehind assertion MUST be fixed length" in regex?

For example,the regex below will cause failure reporting lookbehind assertion is not fixed length: #(?<!(?: ... kind of restriction doesn't exist for lookahead. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pcre - Regex Substitution: only replace the first occurance from a "or" condition

I need to replace d+ and a+ to x, I want to replace all the d+ to x, but for a+, I ... /questions/65934161/regex-substitution-only-replace-the-first-occurance-from-a-or-condition...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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