Regular Expressions 101

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/
[Ticket: (\d+)]
/
gm
Match a single character present in the list below
[Ticket: (\d+)]
Ticket: (
matches a single character in the list Ticket: ( (case sensitive)
\d matches a digit (equivalent to [0-9])
+)
matches a single character in the list +) (case sensitive)
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