My ng-pattern validation includes a regex pattern ^[^\./:*\?\"<>\|]{1}[^\/:*\?\"<>\|]{0,254}$ to prevent invalid characters in file paths and set a limit. However, when I specify the ng-pattern as:
ng-pattern = "^[^\\\./:\*\?\"<>\|]{1}[^\\/:\*\?\"<>\|]{0,254}$"
The ng-pattern displays the regex incorrectly. Can anyone offer guidance on how to implement this correctly?
At the outset, there seems to be an issue with your regex due to excessive escaping symbols. In this case, you only need to escape the " and \\.
To tackle a " within the ng-pattern attribute, consider defining it as \x22 or ":
var app = angular.module("app", []);<html ng-app="app">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
</head>
<body>
<form name="form">
<p>Enter text to validate:</p>
<input type="text" ng-model="name" name="name" ng-pattern="/^[^\\\\./:*?"<>|][^\\\\/:*?\x22<>|]{0,254}$/" ng-trim="false" />
<div ng-show="form.name.$error.pattern">Text doesn't match with ng-pattern!</div>
</form>
</body>
</html>You can also resolve the problem by creating a regex in the controller using a regular string literal, where you can employ '.."..' or "..\"...". Subsequently, utilize the variable name within {{...}} in the ng-pattern attribute. Keep in mind that to match a literal \, you will need to use 4 backslashes in the regex pattern.
var app = angular.module("app",[]);
app.controller("FormCtrl", function($scope) {
$scope.regex = "/^[^\\\\./:*?\"<>|][^\\\\/:*?\"<>|]{0,254}$/";
});<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app">
<form name="theForm" ng-controller="FormCtrl" novalidate>
<input type="text" name="filename" placholder="filename" ng-model="filename" ng-pattern="{{regex}}" required />
<div class="error"
ng-show="(theForm.filename.$dirty || attempted) && theForm.filename.$invalid">
<small class="error text-danger"
ng-show="theForm.filename.$error.required">
Please enter a file name.
</small>
<small class="error text-danger"
ng-show="theForm.filename.$error.pattern">
Please enter a valid file name.
</small>
</div>
</form>
</div>I encountered a dilemma when attempting to avoid using single and double quotes within an ng-pattern, similar to the issue described earlier. However, I discovered a method to incorporate single or double quotes directly without relying on a variable:
<input type="text" ng-pattern="/^[^"']+$/" />
To escape the character ", simply use \".
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