Regular Expressions 101

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/
((?:\d{2})(?:\:\d{2}){2}).*?\[\s(\d+).*?\[\s(\d+)
/
gm
1st Capturing Group
((?:\d{2})(?:\:\d{2}){2})
Non-capturing group
(?:\d{2})
\d
matches a digit (equivalent to [0-9])
{2} matches the previous token exactly 2 times
Non-capturing group
(?:\:\d{2}){2}
{2} matches the previous token exactly 2 times
\: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{2} matches the previous token exactly 2 times
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
2nd Capturing Group
(\d+)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
3rd Capturing Group
(\d+)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Global pattern flags
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)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String

Substitution

Processing...