Regular Expressions 101

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/
(\w)(?:=([^\s;][^;\n]))?
/
gm
1st Capturing Group
(\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)
Non-capturing group
(?:=([^\s;][^;\n]))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
= matches the character = literally (case sensitive)
2nd Capturing Group
([^\s;][^;\n])
Match a single character not present in the list below
[^\s;]
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
; matches the character ; literally (case sensitive)
Match a single character not present in the list below
[^;\n]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
; matches the character ; literally (case sensitive)
\n matches a line-feed (newline) character (ASCII 10)
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