I want a regular expression for only accepting
0-9999
No spaces, no letters.
However, “blank”(empty) is allowed.
I want a regular expression for only accepting 0-9999 No spaces, no letters. However,
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I want a regular expression for only accepting
0-9999
No spaces, no letters.
However, “blank”(empty) is allowed.
Should do it.
Or more succinctly:
This works because you’re saying “0, 1, 2, or 3 digits”, where each digit is 0-9. This allows numbers between 0 and 9999, and nothing else.
Note that it allows leading zeros, i.e. 0004 is a valid number.