I'm trying to write RegEx to match some strings like ABCD1234567, 123ABC456D7 or 12A34B56C7D. There should be 4 characters and 7 digits, order is not important. And there shouldn't be any special characters like *.,- etc.
I already tried to write something like this.
^[A-Zaz]{4}[0-9]{7}$
Can someone help me?
The pattern ^[A-Zaz]{4}[0-9]{7}$ matches 4 times A-Za-z and 7 digits in that order.
You could use lookaround assertions with quantifiers instead:
^(?=(?:[^A-Za-z\r\n]*[A-Za-z]){4})(?=(?:[^0-9\r\n]*[0-9]){7})[A-Za-z0-9]+$
^ Start of string(?=(?:[^A-Za-z\r\n]*[A-Za-z]){4}) Assert 4 chars A-Z(?=(?:[^0-9\r\n]*[0-9]){7}) Assert 7 digits[A-Za-z0-9]+ Match 1+ times any of the listed or use [A-Za-z0-9]{11} to match exactly 11$ End of stringI'd use a lookahead to check for the allowed characters and exact length and match the rest.
^(?=[A-Za-z\d]{11}$)\d*(?:\D\d*){4}$
(?=[A-Za-z\d]{11}$) the lookahead checks for exactly 11 [A-Za-z\d]\d*(?:\D\d*){4} matches exactly 4 digits with any \D non digits in between