The difference between ?=
and ?!
is that the former requires the given expression to match and the latter requires it to not match. For example a(?=b)
will match the “a” in “ab”, but not the “a” in “ac”. Whereas a(?!b)
will match the “a” in “ac”, but not the “a” in “ab”.
The difference between ?:
and ?=
is that ?=
excludes the expression from the entire match while ?:
just doesn’t create a capturing group. So for example a(?:b)
will match the “ab” in “abc”, while a(?=b)
will only match the “a” in “abc”. a(b)
would match the “ab” in “abc” and create a capture containing the “b”.
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