在 RegEx 中检测角括号和大括号

Question

I have a regular expression to validate a text box to only allow particular characters. The expression currently I have is

pattern = "^([-_,A-Za-z0-9 !@#$%^&()=+;'.~`]{1,60})$";

to report an error if a character other than is input. This works perfectly. Now I want to allow [ , ] , { and } (the square and curly brackets) as valid characters. I tried including these but the IsMatch method always returns false if I include them in the pattern I have. I added them as follows,

pattern = "^([-_,A-Za-z0-9 !@#$%^&()[]{}=+;'.~`]{1,60})$";

I tested this for only alpha numeric string value. IsMatch returns false on that too. I pretty sure I am doing something wrong with the new thing included.

Can any one let me know what's wrong in the modified pattern?

Answer 1

You need to escape the square brackets inside the square brackets.

pattern = "^([-_,A-Za-z0-9 !@#$%^&()\[\]{}=+;'.~`]{1,60})$";

BTW: {} are braces, or curly braces, not angle brackets.

Answer 2

If you want your regex to be portable, put the closing square bracket first and hyphen last, as discussed here: http://www.regular-expressions.info/posixbrackets.html

pattern = "^([][_,A-Za-z0-9 !@#$%^&(){}=+;'.~`-]{1,60})$";