I am trying to create a regex to validate a field where the user can enter a 5 digit number with the option of adding a /
followed by 3 letters. I have tried quite a few variations of the following code:
^(\d{5})+?([/]+[A-Z]{1,3})?
But I just can't seem to get what I want.
For instance l would like the user to either enter a 5 digit number such as 12345
with the option of adding a forward slash followed by any 3 letters such as 12345/WFE
.
You probably want:
^\d{5}(?:/[A-Z]{3})?$
You might have to escape that forward slash depending on your regex flavor.
Explanation:
^
- start of string anchor \\d{5}
- 5 digits (?:/[AZ]{3})
- non-capturing group consisting of a literal /
followed by 3 uppercase letters (depending on your needs you could consider making this a capturing group by removing the ?:
). ?
- 0 or 1 of what precedes (in this case that's the non-capturing group directly above). $
- end of string anchor All in all, the regex looks like this:
你可以使用这个正则表达式
/^\d{5}(?:\/[a-zA-Z]{3})?$/
^\d{5}(?:/[A-Z]{3})?$
这是实践中(这是一个测试你的正则表达的好网站): http ://regexr.com?36h9m
^(\d{5})(\/[A-Z]{3})?
测试为rubular
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