Added email validator

apps/dafa-web/src/app/shared/utils/validators/email.validator.ts

@@ -0,0 +1,14 @@
+import { AbstractControl, ValidatorFn } from '@angular/forms';
+import { ValidationError } from '@dafa-models/validation-error.model';
+
+export function EmailValidator(label = 'Fältet'): ValidatorFn {
+  const emailRegex = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$/;
+
+  return (control: AbstractControl): ValidationError => {
+    if (control && control.value && !emailRegex.test(control.value)) {
+      return { type: 'invalid', message: `Ogiltig ${label}` };
+    }
+
+    return null;
+  };
+}