CODEWITHSUNDEEP
phpregexsyntaxpreg-match
BentCoder
BentCoder

Reputation: 12740

preg_match() or similar function for checking currency

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 preg_match() example or any other function to deal with possible cases above. I tried with example below but it is not working properly. Any chance given me a most appropriate pattern for it?

if (! preg_match('/^[0-9.,]$/', $currency)) { echo 'No good.'; }

Upvotes: 0

Views: 3550

Answers (2)

nickb
nickb

Reputation: 59709

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

Upvotes: 5

Niet the Dark Absol
Niet the Dark Absol

Reputation: 324790

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

Upvotes: 0

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