I ran into this RegExp /[[0]]/
in JavaScript, and have been wondering what it means.
I know that the outer pair of []
should be use as a character class, but what about the inner pair? I searched in Google and found this link , but "Collating Sequences" doesn't seem to be it 'cuz I can't get /[[.some.]]/
work as this page claims.
Thanks in advance if anyone can give me a hint.
/[[0]]/
is equivalent to:
[
or 0
character, followed by a ]
character.
[]
0]
[0
[0]
(matches 0]
) In other words: /(\\[|0)\\]/
or /[\\[0]\\]/
In real words: ( [ or 0 ) plus ]
.
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