Regular Expressions 101

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\bмыла\b
/
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
мыла matches the characters мыла literally (case sensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String