[英]Validating input using regular expression in Javascript
I need to validate text box, it should accept only alphabets (capital or small), digits, and .,?-_
. 我需要验证文本框,它应该只接受字母(大写或小写),数字和.,?-_
。 It should not accept any other values. 它不应该接受任何其他值。 It should not accept same value like ......
or ,,,,,
or -----
or ????
它不应该接受相同的值,如......
或,,,,,
或-----
或????
or _____
. 或_____
。 It should not accept values like ,._
it should contain either alphabet or digit with this, like eg _.ab.?
它不应该接受像这样的值,._
它应该包含字母或数字,例如_.ab.?
. 。
So you want the string to contain at least one (ASCII) alphanumeric character and at least two different characters? 所以你希望字符串包含至少一个(ASCII)字母数字字符和至少两个不同的字符?
Try 尝试
/^(?=.*[A-Z0-9])(?!(.)\1*$)[A-Z0-9.,?_-]*$/i
Explanation: 说明:
^ # start of string
(?=.*[A-Z0-9]) # assert that there is at least one of A-Z or 0-9
(?!(.)\1*$) # assert that the string doesn't consist of identical characters
[A-Z0-9.,?_-]* # match only allowed characters
$ # until the end of the string
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