preg_match() or similar function for checking currency

Question

1.449,00
1.000.000,55
19,90
etc
etc

I know what I listed above are very variable but there are possibilities for currency. I\'m looking for a

Answer 1

Add + after the ] to allow more than just one character.

Answer 2

Something like this should work:

/^((?:\d{1,3}[,\.]?)+\d*)$/

This matches:

^         - Start of string
(         - Capture the following:
 (?:      
  \d{1,3} - One to three digits
  [,\.]?  - And an optional separator (comma or period)
 )+       - One or more times
 \d*      - Zero or more digits
)
$         - End of string

It works by iteratively matching everything to the left side of the separator (if it's present), and then has \d* to pick up any optional fractions of currency.

You can see it passes all of your tests.

Edit: An updated regex looks like this:

^((?:\d\.\d{3}\.|\d{1,3}\.)?\d{1,3},\d{1,2})$

Where we match either:

• \d\.\d{3}\. - One digit, a period, three digits, a period, OR
• \d{1,3}\. - One and three digits, a period
• None of the above (because of the ?)

Then, we match:

• \d{1,3}, - One to three digits and a comma, followed by
• \d{1,2} - One or two digits