how to allow only one caret symbol between acceptable inputs using regex
I want to check some of the acceptable inputs using regex. following is the list of acceptable values
Acceptable Values :12345, VS12345, 12345^67890, VS12345^VS67890, VSGC1234
Also i want check if special characters are entered more than one as only one caret is allowed.
Use a negative lookahead
(?!.*\^.*\^)to ensure that the string to capture doesn't contain more than 1 caret
Or if your only concern is to not catch multiple caret symbols and allow anything else:
^- Start of string
(?!.*\^.*\^)- Match the pattern only if the next characters doesn't contain 2 or more caret
[\^\dA-Z]*- Match any caret, digit, and capital letter. With the previous assertion, it will be sure that this will not contain more than 2 caret symbols.
$- End of string