src/additional/currency.js

/**
 * Validates currencies with any given symbols by @jameslouiz
 * Symbols can be optional or required. Symbols required by default
 *
 * Usage examples:
 *  currency: ["£", false] - Use false for soft currency validation
 *  currency: ["$", false]
 *  currency: ["RM", false] - also works with text based symbols such as "RM" - Malaysia Ringgit etc
 *
 *  <input class="currencyInput" name="currencyInput">
 *
 * Soft symbol checking
 *  currencyInput: {
 *     currency: ["$", false]
 *  }
 *
 * Strict symbol checking (default)
 *  currencyInput: {
 *     currency: "$"
 *     //OR
 *     currency: ["$", true]
 *  }
 *
 * Multiple Symbols
 *  currencyInput: {
 *     currency: "$,£,¢"
 *  }
 */
$.validator.addMethod( "currency", function( value, element, param ) {
    var isParamString = typeof param === "string",
        symbol = isParamString ? param : param[ 0 ],
        soft = isParamString ? true : param[ 1 ],
        regex;

    symbol = symbol.replace( /,/g, "" );
    symbol = soft ? symbol + "]" : symbol + "]?";
    regex = "^[" + symbol + "([1-9]{1}[0-9]{0,2}(\\,[0-9]{3})*(\\.[0-9]{0,2})?|[1-9]{1}[0-9]{0,}(\\.[0-9]{0,2})?|0(\\.[0-9]{0,2})?|(\\.[0-9]{1,2})?)$";
    regex = new RegExp( regex );
    return this.optional( element ) || regex.test( value );

}, "Please specify a valid currency." );