Regular Expressions 101

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/
run\:\'(?<run>\w)'
/
gm
run matches the characters run literally (case sensitive)
\: matches the character : literally (case sensitive)
\' matches the character ' literally (case sensitive)
Named Capture Group run
(?<run>\w)
\w
matches any word character (equivalent to [a-zA-Z0-9_])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
' matches the character ' literally (case sensitive)
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