Java regexp list of another regexp

Question

I have this regular exp \d{2}/\d{2}/\d{4} that we use to validate a string format (weird business rule)

now that field allows a comma separated list, of those strings, so I need to change the reg exp, I know how to do a it for digits, or for strings, but I cant do it for this.

can someone help me? thanks !

Answer 1

You may use

^\d{2}/\d{2}/\d{4}(?:,\d{2}/\d{2}/\d{4})*$

It matches your pattern first and then zero or more sequencesof a comma and your pattern. Anchors are not necessary if you use the pattern with matches method.

Replace the comma with \s*,\s* if there can be whitespaces around the comma.