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

I want a regex that matches a square bracket [. I haven't found one yet. I think I tried all possibilities, but haven't found the right one. What is a valid regex for this?

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

Try using \\[, or simply \[.

If you want to match an expression starting with [ and ending with ], use \[[^\]]*\].

Here is the meaning of each part (as explained at www.regexr.com):

Are you escaping it with \?

/\[/

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

Regular-Expressions.info

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