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Re: Need a regular expression to check the first digitby davido (Cardinal) |
on May 19, 2021 at 14:55 UTC ( [id://11132741]=note: print w/replies, xml ) | Need Help?? |
Let's analyze this regex: /^[5]+$/
Taken in full, you're saying starting from the beginning and ending at the end of the target string, match one or more 5 characters, and nothing else. You didn't allow for the trailing digits. Since you anchor to the end of the string, you're asserting that the string can only contain a bunch of 5s. If you want to allow for eight trailing digits that are not 5s, you need to specify that too: /^5\d{8}$/Now you're saying the target has to start with a 5 and then must match eight more digits, at which point the target string must end. Dave
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