Regular Expressions 101

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/
(ERROR|WARNING|INFO):([^:]+):(\d+),(\d+):(.+)
/
gm
1st Capturing Group
(ERROR|WARNING|INFO)
1st Alternative
ERROR
ERROR
matches the characters ERROR literally (case sensitive)
2nd Alternative
WARNING
WARNING
matches the characters WARNING literally (case sensitive)
3rd Alternative
INFO
INFO
matches the characters INFO literally (case sensitive)
: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
2nd Capturing Group
([^:]+)
Match a single character not present in the list below
[^:]
+ 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)
: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
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)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
4th 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 the character : with index 5810 (3A16 or 728) literally (case sensitive)
5th 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)
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