What's the regular expression that match a square bracket?

Question

Hi!
I have been playing with JFlex and at this moment I want to get a regex that match a square bracket "[", but I don't find it. I think I tried all posivilities but the right.
Some help?

Answer 1

How about using backslash (\) in front of the square bracket. Normally square brackets match a character class.

Answer 2

did you tried \\[ or simply \[ ?

Answer 3

does it work with an antislash before the '[' ?

\[ or \\[ ?

Answer 4

Are you escaping it with "\"?

/\[/

Here's a helpful resource to get started with Regular Expressions:

Regular-Expressions.info

Answer 5

In general, when you need a character that is "special" in regexes, just prefix it with a \. So a literal [ would be \[.

Answer 6

If you're looking to find both variations of the square brackets at the same time, you can use the following pattern which defines a range of either the "[" sign or the "]" sign: /[\[\]]/