Regular Expressions 101

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/
(?<=family\:\s)[\s\S]*?(?=[;\s])
/
g
Positive Lookbehind
(?<=family\:\s)
Assert that the Regex below matches
family
matches the characters family literally (case sensitive)
\: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Match a single character present in the list below
[\s\S]
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
\S matches any non-whitespace character (equivalent to [^\r\n\t\f\v ])
Positive Lookahead
(?=[;\s])
Assert that the Regex below matches
Match a single character present in the list below
[;\s]
; matches the character ; with index 5910 (3B16 or 738) literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
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