PHP preg_match 1 string 2 digit validation

Question

value: a11b22c33

I want to validate above value with preg_match with 1 string and 2 numbers

preg_match('/^\s{1}\d{2}\s{1}\d{2}\s{1}\d{2}$/', $value)

I tried but it didn't work.

You never need {1}. Everything matches once unless you quantify it. — Barmar
– Barmar, Commented Jul 26, 2021 at 20:17

Barmar · Accepted Answer · 2021-07-26 20:42:16Z

2

Use this:

preg_match('/^([a-z]\d{2}){3}$/', $value)

\s matches whitespace, [a-z] matches lowercase letters. If you also need uppercase letters, add the i modifier after the second / to make it case-insensitive.

Since you're repeating the same pattern 3 times, I've grouped it and used the {3} quantifier rather than writing it out 3 times.

edited Jul 26, 2021 at 20:42

answered Jul 26, 2021 at 20:20

Barmar

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3 Comments

SweetNGX Over a year ago

A smarter way than I thought. Thanks +1

AbraCadaver Over a year ago

Good one. Unless I'm mistaken you don't need the ?:

Barmar Over a year ago

@AbraCadaver Right. I'm so used to using the $match argument.

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