I am trying to allow alphanumeric and some special characters
var regx = /^[A-Za-z0-9._-\] ]+$/;
I tried escaping the ] sign with the forward slash but it still doesnt work. What am I missing
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what are you testing, and what went wrong?wolffer-east– wolffer-east2014-08-28 20:01:28 +00:00Commented Aug 28, 2014 at 20:01
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I believe you mean the backslash(\), not the forward slash (/).Mike Cluck– Mike Cluck2014-08-28 20:03:21 +00:00Commented Aug 28, 2014 at 20:03
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2 Answers
You also need to escape the - character:
/^[A-Za-z0-9._\-\] ]+$/
//------------^
Escaping - is not always necessary. Here, however, it is used inside square brackets which makes the JavaScript engine assume that you are trying to specify the range from _-] which causes a "Range out of order in character class" error.
Note that /[_-a]/ is valid regex and matches characters _, ` and a (ASCII codes 95...97); which may not be the desired outcome.
Comments
If you try your regex on an online regex tester like regex101 you'd get the error:
You have to escape - using \-:
^[A-Za-z0-9._\-\] ]+$
Btw, you can shorten your regex to:
^[\w.\-% ]+$
Edit: added regex for your comment:
^[\w.-\]\[ #$>()@{}'"]+$
2 Comments
Mary
I modified the regex : var regx = /^[A-Za-z0-9._-% ]+$/; I included % and now when I run it in Chrome I get syntax error range out of order in character class. I would like to include special characters like #$>[]()@{}'" and alphanumeric.
Federico Piazza
@Mary I've updated my answer for your comment. Regex has special characters that need to be escaped, so dash is one that you need to escape it as \-. Btw, if your question is answered you may consider marking your question as solved