Character limitation in regular expression won't work

Question

I want to check the string if it obeys these rules:

• First part: 2 digits
• 1 space
• Second part: Capital letters. 1, 2 or 3 characters
• 1 space
• Third part: 2, 3 or 4 digits

My regular expression:

/\d{2}\s.[A-Z]{1,3}\s.\d{2,4}/

It works with most strings but it doesn't with some like these:

• 134 HY 723 (It shouldn't allow 3 digits in first part)
• 34 H 723 (It should allow one letter in second part)
• 34 HD 723435 (It shouldn't allow over 4 digits in third part)

Answer 1

Use this one:

/^\d{2}\s[A-Z]{1,3}\s\d{2,4}$/

You were missing the anchors (^ and $). Your original one would match, say, 134 HY 723, by matching 34 HY 723.

I also removed two random .s. (I have no idea why they were there)