Regular Expressions 101

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/
[ ]*(.+):[ ]*\n?((?:.+\n?[^\s])*)
/
gm
Match a single character present in the list below
[ ]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
1st Capturing Group
(.+)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
Match a single character present in the list below
[ ]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
\n
matches a line-feed (newline) character (ASCII 10)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
2nd Capturing Group
((?:.+\n?[^\s])*)
Non-capturing group
(?:.+\n?[^\s])*
* matches the previous token between zero 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 one and unlimited times, as many times as possible, giving back as needed (greedy)
\n
matches a line-feed (newline) character (ASCII 10)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
Match a single character not present in the list below
[^\s]
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
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