Regex Track1 Magnetic Stripe

Question

How can I create regex rule for name in Track1, following these rules:

• Allowed Characters would be: ABCDEFGHIJKLMNOPQRSTUVWXYZ 0123456789 .()-$
• Not Allowed Characters would be: ^!"&'*+,:;<=>@_[]#%?
• Required character - only must character / appear
• The max size is 26 characters , min size 2.

I tried:

\^[^\^!"&'*+,:;<=>@_\[\]\\#%?]{2,26}\^ Result FAIL: removing "/" will pass pattern 
\^([-.()0-9a-zA-Z]*\/[-.()\w\s\/]*){1,26}\^ Result FAIL: more than 26 characters will pass pattern
^[-.()\w\s\/]{2,26}\^ Result FAIL: removing "/" will pass pattern

Sample of Name in Track1:

• ^TEST/TEST^- Should Pass
• ^TEST TEST^- Should Fail
• ^TEST/TE/ST^ - Should Fail
• ^TEST/TE+ST^ - Should Fail

Thanks!

Answer 1

If there has to be at least ^ at the start and end, and there has to be at least a single / then the minimum amount of characters would be 3 instead of 2.

In that case, you might use:

\^(?=[A-Z .()\/-]{1,24}\^)[A-Z .()-]*\/[A-Z .()-]*\^

Explanation

• \^ Match ^
• (?=[A-Z .()\/-]{1,24}\^) Positive lookahead, assert 1,24 of the allowed chars followed by ^ to the right to make a total of 2-26 characters
• [A-Z .()-]*\/[A-Z .()-]* Match / between optional allowed chars
• \^ Match ^

See a regex demo.

If the / can not be at the start or at the end (matching at least 5 characters in that case)

\^(?=[A-Z .()\/-]{1,24}\^)[A-Z .()-]+\/[A-Z .()-]+\^

See another regex demo