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Asked: 2026-05-15T06:14:19+00:00

I’m looking for a regex to validate initials. The only format I want it

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I’m looking for a regex to validate initials. The only format I want it to allow is:

(a capital followed by a period), and that one or more times

Valid examples:

A.
A.B.
A.B.C.

Invalid examples:

a.
a
A
A B
A B C
AB
ABC

Using The Regulator and some websites I have found the following regex, but it only allows exactly one upper (or lower!) case character followed by a period:

^[A-Z][/.]$

Basically I only need to know how to force upper case characters, and how I can repeat the validation to allow more the one occurence of an upper case character followed by a period.

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1 Answer

  1. Editorial Team

    You almost has it right: + says “one or more occurenses” and it’s \., not /.

    Wrapping it in () denotes that it’s a group.

    ^([A-Z]\.)+$
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