Regular Expressions 101

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/
&\w{0,}?;
/
g
& matches the character & with index 3810 (2616 or 468) literally (case sensitive)
\w
matches any word character (equivalent to [a-zA-Z0-9_])
{0,}? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
; matches the character ; with index 5910 (3B16 or 738) 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.

Regular Expression
No Match

/
/
g

Test String