Regular Expressions 101

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/
^(.)(rticle|ndex|hell)\/(\d+)
/
gm
^ asserts position at start of a line
1st Capturing Group
(.)
. matches any character (except for line terminators)
2nd Capturing Group
(rticle|ndex|hell)
1st Alternative
rticle
rticle matches the characters rticle literally (case sensitive)
2nd Alternative
ndex
ndex matches the characters ndex literally (case sensitive)
3rd Alternative
hell
hell matches the characters hell literally (case sensitive)
\/ matches the character / literally (case sensitive)
3rd Capturing Group
(\d+)
\d+
matches a digit (equal to [0-9])
+ Quantifier — Matches 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

Substitution

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