Regular Expressions 101

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/
\\(\w)*\\
/
mg
\\ matches the character \ with index 9210 (5C16 or 1348) literally (case sensitive)
1st Capturing Group
(\w)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
\w matches any word character (equivalent to [a-zA-Z0-9_])
\\ matches the character \ with index 9210 (5C16 or 1348) literally (case sensitive)
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
mg

Test String

Substitution

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