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)Line terminator(s) are \n
*? 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)Line terminator(s) are \n
*? 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])g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)