Regular Expressions 101

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/
(\S+):(?|([^"\s]+)|"([^"]+))
/
g
1st Capturing Group
(\S+)
\S
matches any non-whitespace character (equivalent to [^\r\n\t\f\v ])
+ 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)
Branch Reset Group
(?|([^"\s]+)|"([^"]+))
Subpatterns declared within each alternative of this construct will start over from the same index.
1st Alternative
([^"\s]+)
2nd Capturing Group
([^"\s]+)
Match a single character not present in the list below
[^"\s]
+ 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)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
2nd Alternative
"([^"]+)
" matches the character " literally (case sensitive)
2nd Capturing Group
([^"]+)
Match a single character not present in the list below
[^"]
+ 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)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String