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-separator, but not in the beginning or the end.
• It allows only 2 digits rounded after decimal point.
• It allows only one decimal point and not in the beginning or the end.

Valid:

$1,530,602.24 1,530,602.24 

Invalid:

$1,666.24$ ,1,666,88, 1.6.66,6 .1555. 

I tried /^\$?[0-9][0-9,]*[0-9]\.?[0-9]{0,2}$/i; it works fine except it matches 1,6,999.

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/>');  }