Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I want to match strings like this: !! so I suppose the input have the right elements but whether the they are evaluable, that is left for the evaluator!
1+(2-3)*(4/5)
what is the regex for matching this, something like this: ([0-9\+-\*/\(\)]+)? but this seems not working.
If you are only asking for a character validation, you can use
You don’t need to escape characters in a character class (inside square brackets). And if you must include an hyphen, you HAVE to put it at the end, otherwise it would be considered as the character range operator.
That said, keep in mind this will only guarantee you that you have no other characters. It will NOT validate the structure (regexes are not the right tool for that). However, since you stated an evaluator will then process the input, that might be right for you.