Regular Expressions 101

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/
([^abc]*)(.*)
/
gm
1st Capturing Group
([^abc]*)
Match a single character not present in the list below
[^abc]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
abc
matches a single character in the list abc (case sensitive)
2nd Capturing Group
(.*)
.
matches any character (except for line terminators)
* matches the previous token between zero 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