Regex currency validation

Question

I need Help for currency regex in jQuery function.

• It optionally allows \"$\" sign only one time in beginning.
• It allows comma as digital-group-separ

Answer 1

The RegEx

// Requires a decimal and commas
^\$?(([1-9]\d{0,2}(,\d{3})*)|0)?\.\d{1,2}$

// Allows a decimal, requires commas
(?=.*\d)^\$?(([1-9]\d{0,2}(,\d{3})*)|0)?(\.\d{1,2})?$

// Decimal and commas optional
(?=.*?\d)^\$?(([1-9]\d{0,2}(,\d{3})*)|\d+)?(\.\d{1,2})?$

// Decimals required, commas optional
^\$?(([1-9]\d{0,2}(,\d{3})*)|0)?\.\d{1,2}$

// *Requires/allows X here also implies "used correctly"

The RegEx Breakdown

• When the optional parts are too liberal, we need to look ahead and guarantee there's a number: (?=.*\d)
• May or may not start with a dollar sign (I assume negatives are invalid): ^\$?
  • Follow that with -? to allow negative numbers
• Begins with 1-3 numbers: [1-9]\d{0,2}
  • Could almost be (\d{1,3}), but that would allow "0,123"
  • One exception, can start with 0 in the case of "$0.50" or "0.50": |0
  • These regexes assume multiple leading 0's are invalid
• Any number of three digit numbers separated by comma: (,\d{3})*
  • Remove ? before \. if you want to disallow numbers starting with "$."
• Requires or allows decimal (one or two digits): \.\d{1,2} or (\.\d{1,2})? respectively
• End with $ (unescaped) to make sure there's nothing after a valid number (like $1,000.00b)

To use the regex, use the string's match method and encase the regex between two forward slashes.

// The return will either be your match or null if not found
yourNumber.match(/(?=.)^\$?(([1-9][0-9]{0,2}(,[0-9]{3})*)|0)?(\.[0-9]{1,2})?$/);

// For just a true/false response
!!yourNumber.match(/(?=.)^\$?(([1-9][0-9]{0,2}(,[0-9]{3})*)|0)?(\.[0-9]{1,2})?$/);

Basic Usage Example

Demo with Test Cases

var tests = [
    "$1,530,602.24", "1,530,602.24", "$1,666.24$", ",1,666,88,", "1.6.66,6", ".1555."
];

var regex = /(?=.*\d)^\$?(([1-9]\d{0,2}(,\d{3})*)|0)?(\.\d{1,2})?$/;

for (i = 0; i < tests.length; i++) { 
  console.log(tests[i] + ' // ' + regex.test(tests[i]));
  document.write(tests[i] + ' // ' + regex.test(tests[i]) + '<br/>');
}

Answer 2

Here is the regular expression that should achieve this for you.

The start must be numeric or $ sign. There can be any number of digits with commas, but it must start and end with a digit. There can optionally be a decimal point with up to two digits after it at the end of the line.

var your_input = "$1,000,000.00";
var valid_dollar_amt_regex = /^\$?[0-9][0-9,]*[0-9]\.?[0-9]{0,2}$/i;

if(valid_dollar_amt_regex.test(your_input))
    alert("Valid!");

Or use this function

function validate_money(i) {
    var valid_dollar_amt_regex = /^\$?[0-9][0-9,]*[0-9]\.?[0-9]{0,2}$/i;
    return valid_dollar_amt_regex.test(i);
}

See it working: http://jsfiddle.net/znuJf/