Regular Expressions 101

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/
\bmartin_v12\b
/
i
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
martin_v12
matches the characters martin_v12 literally (case insensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
i

Test String