Regular Expressions 101

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/
\.(css|js)\?ver=\d\.\d\.\d$
/
gm
\. matches the character . literally (case sensitive)
1st Capturing Group
(css|js)
1st Alternative
css
css matches the characters css literally (case sensitive)
2nd Alternative
js
js matches the characters js literally (case sensitive)
\? matches the character ? literally (case sensitive)
ver= matches the characters ver= literally (case sensitive)
\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 . literally (case sensitive)
\d matches a digit (equivalent to [0-9])
\.
matches the character . literally (case sensitive)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\d
matches a digit (equivalent to [0-9])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of a line
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