Regular Expressions 101

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/
s(\d)
/
gm
s matches the character s with index 11510 (7316 or 1638) literally (case sensitive)
1st Capturing Group
(\d)
\d matches a digit (equivalent to [0-9])
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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