I need a regular expression that accepts only [ , ] , - and letras and números to be used as follows:
[ , then comes letters numbers and - and ends with ] . - . You can use this way: /^\[[\w][\w\-]*[\w]+\]$/
( online example )
What regex does:
^ indicates the beginning of the string \[ indicates the own character [ , escaped not to be interpreted as list [\w]+ accepts numbers and letters. One or more times [\w\-] the same as the previous plus the characters _ and - , zero or multiple times. [\w]+ I put this class back but without \- to ensure that the last character before the ] end is not a - . \] indicates the character ]
$ indicates end of string If you want to prevent it from having only numbers and the - separator you can check with negative lookahead which in the background is another regex with what is not allowed. In this case it would look like this: /^(?!^\[[\d\-]+\]$)\[[\w][\w\-]*[\w]+\]$/ , where (?!xxx) is what indicates this negative check.
( online example )