Home/ Questions/Q 6199783
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-24T04:14:58+00:00

I’m working on a PHP application. I need to validate that a string is

  • 0

I’m working on a PHP application. I need to validate that a string is useable as a currency value. I would like the following to validate:

$5.00  
5  
5.00   
£5.00

I want the pattern to be liberal enough to accept a reasonable string. I would also like it to accept an currency symbol; however, to validate currency, it can be any character or characters because I’ll ultimately store the value as a two decimal float. So, ‘$5.00’ or ‘USD 5.00’ would become ‘5.00’ when stored in the database. I’m currently using the following:

preg_match('/^[0-9]*\.?[0-9]+$/',$value)

It works for “5” or “5.00”, but it does not account for the currency symbol. How do I adjust this to allow for the currency symbol?

Thank you!

EDIT: According to a comment below, it looks like my regex will allow too many decimals. Can you also help me sort out that issue?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    To allow all currency symbols you will need to use Unicode Character Properties

    \p{Sc} or \p{Currency_Symbol}: any currency sign.

    Try with this one:

    $value=preg_replace('/^(\p{Sc}?\d*)((\.|,)\d\d\d)?\d*$/u','$1$2',$value);

    But if you are expecting the number from an input, will be better make a form where the user specify the currency from a selectable list, and just take care whether the user will only introduce numbers, that’s how PAYPAL does.

    • 0