Angularjs regular expression to restrict number of characters issue
Question
I have have the regular expression $scope.pa = /^([\\w-~!@#\\$]+)$/i which is working fine for my requirements. Now I want to restrict this regular expression so that it can allow only 0 to 15 characters. So I have changed it to $scope.pa = /^([\\w-~!@#\\$]+){0,15}$/i; but that 0 to 15 characters restriction is not working out.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"></script>
</head>
<body ng-app="app">
<div ng-controller="controllerName">
<ng-form name="mailForm">
Pname: <input type="text" ng-model="pname" name="pname" ng-pattern="pa" /><br />
<span ng-show="mailForm.pname.$error.pattern" style="color:red">Please enter pname</span>
</ng-form>
</div>
<script>
var app = angular.module("app", []);
app.controller('controllerName', ['$scope', function ($scope) {
$scope.pname = "abcd267g";
$scope.pa = /^([\w-~!@#\$]+)$/i;
}]);
</script>
</body>
</html>
1 answers
solution1
2 2016-11-16 06:18:58
Now I want to restrict this regular expression so that it can allow only 0 to 15 characters.
To achieve this you should be applying range restriction on character class [ ] and not the group ( ) .
Right now you have applied it to whole group /^([\\w-~!@#\\$]+){0,15}$/i which will repeat infinite characters 0 to 15 times. Which renders range restriction useless.
Thus, {0,15} should come after [\\w-~!@#\\$] and your regex will be:
/^([\\w\\-~!@#\\$]{0,15})$/i;
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