CODEWITHSUNDEEP
regexvalidation
Mike
Mike

Reputation: 375

Need Reg Exp. to match fixed length field for digits and spaces only

I'm trying to get a reg. Expression to match a pattern of exactly 11 digits OR 0 to 10 digits padded to 11 characters w/ spaces (\x20).

Match: “12345678901”,  “           “, “123        “

Don't Match: “    5678901”, “123   78901”, “123   789  ”

The expression '/((\d)|(\x20)){11}/' matches the desired strings however it also still matches strings that have leading and internal spaces. I've played w/ various combinations of the leading / trailing anchors (^,$) but can't seem to get the right result. Any help will be much appreciated.

Upvotes: 2

Views: 226

Answers (2)

anubhava
anubhava

Reputation: 784998

You can use this lookahead based regex:

^(?=\d* *$)[\d ]{11}$

RegEx Demo

Upvotes: 3

Mark Shevchenko
Mark Shevchenko

Reputation: 8197

I recommend you to test this condition in your code, cause regex will be too ugly.

\d{11}|\s\d{10}|\s{2}\d{9}|\s{3}\d{8}|\s{4}\d{7}|\s{5}\d{6}|\s{6}\d{5}|\s{7}\d{4}|\s{8}\d{3}|\s{9}\d{2}|\s{10}\d|\s{11}

Upvotes: 1

Related Questions