i would like to check string using js's regex. i would like write a pattern which is like this; if string contains [^a-zA-Z0-9_] return must be true else return must be false.
Thank you very for your help already now.
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3 Answers
Use .test:
/[^a-zA-Z0-9_]/.test(str);
Edit:
/[^a-zA-Z0-9_İıĞğÇçÖöÜüÖö]/.test(str);
However, your regular expression will basically check whether there is a character that's not in that list in your string. I don't see the practical use of that. Is it indeed what you're trying to acoomplish?
e.g. a will fail, a- will not fail because the - does match the regexp.
Edit 2: If you want to make sure the string contains only certain characters, use this:
/^[a-zA-Z0-9_-İıĞğÇçÖöÜüÖö]*$/.test(str);
What it does is checking whether there are one or more of the characters of that list in the string, and ^...$ means that it only matches the complete string, so that a% or something like that does not pass (otherwise it would match the a and return true).
Edit 3: If a string should not contain any of a list of characters, use e.g.:
/^[^İıĞğÇçÖöÜüÖö]*$/.test(str); // returns true if there are not any of those characters in the string
7 Comments
Kerberos
Thank you, One more question how to exclude İıĞğÇçÖöÜüÖö chars from a string?
Kerberos
Clearly, i just want to the string contains only english chars (uppercase or lowercase), numbers and specials chars like "_- ". My default languge is Turkish.
Kerberos
i would like to the string does not contains İıĞğÇçÖöÜüÖöŞş%& if string contains any chars of this array "İıĞğÇçÖöÜüÖöŞş" callback return me false with using js.
pimvdb
@Kerberos: Oh that is a different question. I thought you wanted to combine them.
Kerberos
Thank you very much for your help and sorry.
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var string = 'Hello Sir';
var isMatch = /[^a-zA-Z0-9_]/.test(string);
Comments
return /\w/.test(string); // matches Letters,Numbers,and underscore.
