Regular Expressions 101

All the errors detected are listed below, from left to right, as they appear in the pattern.

(?<= Lookbehind must have a fixed width

+ Quantifier makes the containing lookbehind variable-width

* Quantifier makes the containing lookbehind variable-width

\4 Legacy PCRE lookbehind references are disabled in regex101

\5 Legacy PCRE lookbehind references are disabled in regex101

+ Quantifier makes the containing lookbehind variable-width

* Quantifier makes the containing lookbehind variable-width

) Lookbehind must have a fixed width

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Search reference

Regular Expression

(?:^|\n)(\d{4}(?:-\d{2}){2} (?:\d{2}:){2})\d{2}\.\d{3}( [+-]\d{2}:\d{2} )\[\d+\]( - Starting)[^\n]*(?=(?:\n\1\d{2}\.\d{3}\2\[\d+\][^\n]*)*\n\1\d{2}\.\d{3}\2\[\d+\]\3[^\n]*)|(?<=(?:^|\n)(\d{4}(?:-\d{2}){2} (?:\d{2}:){2})\d{2}\.\d{3}( [+-]\d{2}:\d{2} )\[\d+\]( - Starting)[^\n]*(?:\n\4\d{2}\.\d{3}\5\[\d+\][^\n]*)*)\n\4\d{2}\.\d{3}\5\[\d+\]\6[^\n]*

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