In the angular, how can we check if a value match a pattern?

Question

How can I check if a value match certain pattern in the code?

Not use ng-pattern but in the function.

Thanks.

Answer 1

Use pure javascript match function.

var str = "The rain in SPAIN stays mainly in the plain"; 
var res = str.match(/ain/g);

res will be an array with matched values. You can test if there is match checking array length:

if ( res.length > 0 ) 
    console.log("match");

from here

Use it in a directive, better as controller since in Angular 2 there would be no controllers.

Answer 2

For HTML, you need to specify the regex in "pattern" object for e.g:

<form  name="form1" novalidate ng-submit="data.submitTheForm()">
<input type="text" placeholder="Type Here" name="inputName"  ng-model="data.inputName" required="required" pattern="^((?!_)[A-Z a-z0-9])+$" maxlength="20"/></form>

Then you need to add the condition in the controller function called on submit

 $scope.data.submitTheForm = function() {
 if($scope.form1.projectName.$error.pattern)
                {
                alert("Project name should contain only alphanumeric characters");
                return;
                }
 }