Regular Expressions 101

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/
(<!--.*?-->)|(<!--[\S\s]+?-->)|(<!--[\S\s]*?$)
/
g
1st Alternative
(<!--.*?-->)
1st Capturing Group
(<!--.*?-->)
<!-- matches the characters <!-- literally (case sensitive)
.*?
matches any character (except for line terminators)
*? Quantifier — Matches between zero and unlimited times, as few times as possible, expanding as needed (lazy)
--> matches the characters --> literally (case sensitive)
2nd Alternative
(<!--[\S\s]+?-->)
2nd Capturing Group
(<!--[\S\s]+?-->)
<!-- matches the characters <!-- literally (case sensitive)
Match a single character present in the list below
[\S\s]+?
+? Quantifier — Matches between one and unlimited times, as few times as possible, expanding as needed (lazy)
\S matches any non-whitespace character (equal to [^\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
\s matches any whitespace character (equal to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
--> matches the characters --> literally (case sensitive)
3rd Alternative
(<!--[\S\s]*?$)
3rd Capturing Group
(<!--[\S\s]*?$)
<!-- matches the characters <!-- literally (case sensitive)
Match a single character present in the list below
[\S\s]*?
*? Quantifier — Matches between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\S matches any non-whitespace character (equal to [^\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
\s matches any whitespace character (equal to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
$ asserts position at the end of the string
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

Substitution

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Regular Expressions 101

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