Comment vérifier des code postaux en javascript avec jQuery

Code javascript qui sert a vérifier un code postal selon un format (exemple: LLCCC, L = lettre , C = chiffre), ainsi qu’a limiter au maximum les erreurs de saisies en ne permettant aucune erreur,
gère plusieurs format par pays voir par exemple pour l’Angleterre qui a plusieurs format de code postaux.

case "GB":
  var params = {
    'format' : ['LCCLL', 'LLCCLL' , 'LCCCLL', 'LLCCCLL', 'LCLCLL', 'LLCLCLL'],
    'required' : true
}

jquery.zipcode.js

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$(document).ready(function() {
	nice_format = function (format) {
	    var str = '';
	    $.each(format, function() {
		    str += this.replace('L', 'A').replace('C', '1');
		});
	    return str
	}
 
	$.fn.zipCode = function(countryCode) {
	    var id = '#'+$(this).attr('id');	    
	    switch (countryCode) {
	    case "FR":
		var params = {
		    'format' : 'CCCCC',
		    'required' : true
		}
		break;
	    case "US":
		var params = {
		    'format' : 'CCLLLLLL',
		    'required' : true
		}
		break;
	    case "GB":
		var params = {
		    'format' : ['LCCLL', 'LLCCLL' , 'LCCCLL', 'LLCCCLL', 'LCLCLL', 'LLCLCLL'],
		    'required' : true
		}
		break;
	    case "CO":
		var params = {
		    'required' : false
		}
		break;
	    case "AR":
		var params = {
		    'required': false,
		    'format' : 'CCCC',
		}
		break;
	    case "PT":
		var params = {
		    'required' : true,
		    'format' : "CCCC-CCC"
		}
		break;
	    default:
		var params = {
		    'required' : false
		}
		break;
	    }
	    if(params['format'] != undefined && $.isArray(params['format'])) {
		var size = 0;
		var str_format = '';
		$.each(params['format'], function() {
			if(this.length > size) {
			    size = this.length;
			}
			str_format += nice_format(this)+'  ';
		    });
	    } else if(params['format'] != undefined) {
		var size = params['format'].length;
		var str_format = nice_format(params['format']);
	    }	    
	    if(params['required'] && params['format'] != undefined) {
		$(id).css('width', size*12).attr('size', size+2);
		$(id + 'Format').html('format: '+str_format);
	    } else if(!params['required'] && params['format'] != undefined) {
		$(id).attr('size', size+2);
		$(id + 'Format').html('format: '+str_format);
	    } else {
		$(id).attr('size', 12);
		$(id + 'Format').html('');
	    }
	    return params;
	}
 
	$.fn.isValid = function(format) {
	    var value = $(this).val();
	    var patternArray = {
		'L' : '[a-zA-Z]{1}',
		'C' : '[0-9]{1}',
		'-' : '[-]{1}'
	    }
 
	    if(format !== undefined) {
		if(!$.isArray(format)) {
		    var match = true;
		    if(value.length > format.length)
			return false;
		    for(i = 0; i < value.length;i++) {
			var pattern = patternArray[format.charAt(i)];
			var regex = new RegExp(pattern);
			if(!regex.test(value.charAt(i))) {
			    match = false;
			}
		    }
		    return match;
		} else {
		    var match = 0;
		    $.each(format, function() {
			    var count = 0;
			    for(i = 0; i < value.length;i++) {
				var pattern = patternArray[this.charAt(i)];
				var regex = new RegExp(pattern);
				if(!regex.test(value.charAt(i)) || value.length > this.length) {
				    count++;
				}
			    }
			    if(count == 0) {
				match++;
			    }
			});
		    if(match > 0)
			return true;
		    else
			return false;
		}
	    } else {
		return true;
	    }
	}
 
	$('select#country').change(function() {
		$('input#zipCode').val('');
		$('input#zipCode').zipCode($('select#country').val());
	    });
 
	$('input#zipCode').keyup(function() {
		params = $('input#zipCode').zipCode($('select#country').val());
		while(!$('input#zipCode').isValid(params.format)) {
		    $('input#zipCode').val($('input#zipCode').val().substr(0, $('input#zipCode').val().length-1));
		}
	    });
 
	$('input#zipCode').ready(function() {
		$('input#zipCode').after('&nbsp;<span class="comments" id="zipCodeFormat"></span>');
		$('input#zipCode').zipCode($('select#country').val());
	    });
    });