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- PCRE2 (PHP >=7.3)
- PCRE (PHP <7.3)
- ECMAScript (JavaScript)
- Python 2.7
- Golang (RE2)

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((?:\d{2})(?:\:\d{2}){2}).*?\[\s(\d+).*?\[\s(\d+)

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gm

1st Capturing Group

((?:\d{2})(?:\:\d{2}){2})

Non-capturing group

(?:\d{2})

\d{2}

matches a digit (equal to [0-9]){2} **Quantifier** — Matches exactly 2 times

Non-capturing group

(?:\:\d{2}){2}

{2} **Quantifier** — Matches exactly 2 times

\: matches the character : literally (case sensitive)

\d{2}

matches a digit (equal to [0-9]){2} **Quantifier** — Matches exactly 2 times

.*?

matches any character (except for line terminators)*? **Quantifier** — Matches between zero and unlimited times, as few times as possible, expanding as needed (lazy)

\[ matches the character [ literally (case sensitive)

\s matches any whitespace character (equal to [\r\n\t\f\v ])

2nd Capturing Group

(\d+)

\d+

matches a digit (equal to [0-9])+ **Quantifier** — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)

.*?

matches any character (except for line terminators)*? **Quantifier** — Matches between zero and unlimited times, as few times as possible, expanding as needed (lazy)

\[ matches the character [ literally (case sensitive)

\s matches any whitespace character (equal to [\r\n\t\f\v ])

3rd Capturing Group

(\d+)

\d+

matches a digit (equal to [0-9])Global pattern flags

g modifier: **g**lobal. All matches (don't return after first match)

m modifier: **m**ulti line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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gm

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