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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?
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Square brackets match something that you kind of don't know about a string you're looking for. If you are searching for a name in a string but you're not sure of the exact name you could use instead of that letter a square bracket. Everything you put inside these brackets are alternatives in place of one character.
[] denotes a character class. () denotes a capturing group. (a-z0-9) -- Explicit capture of a-z0-9 . No ranges.
[] - Square brackets Here, [abc] will match if the string you are trying to match contains any of the a , b or c . You can also specify a range of characters using - inside square brackets. [a-e] is the same as [abcde] . [1-4] is the same as [1234] .
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
How about using backslash \ in front of the square bracket. Normally square brackets match a character class.
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