Strongest password policy

src/app/core/utils/passwords-utility.ts

@@ -0,0 +1,37 @@
+import { Injectable } from '@angular/core';
+import { AbstractControl, ValidationErrors, ValidatorFn, Validators } from '@angular/forms';
+import { Subscription } from 'rxjs';
+
+
+@Injectable({
+    providedIn: 'root'
+})
+
+export class PasswordsUtility {
+    // password regex pattern
+    public static PASSWORD_REGEX = '^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*[#$@$!%*?&])[A-Za-z\d#$@$!%*?&].{8,}$';
+
+    public getPasswordValidators(): ValidatorFn[] {
+        return [Validators.required, Validators.pattern(PasswordsUtility.PASSWORD_REGEX), Validators.maxLength(50), Validators.minLength(8)];
+    }
+
+    /**
+     * Confirm Change Password of Users
+     * @param controlNameToCompare Form Control Name to be compared.
+     */
+    public confirmPassword(controlNameToCompare: string): ValidatorFn {
+        return (c: AbstractControl): ValidationErrors|null => {
+            if (c.value == null || c.value.length === 0) {
+                return null;
+            }
+            const controlToCompare = c.root.get(controlNameToCompare);
+            if (controlToCompare) {
+                const subscription: Subscription = controlToCompare.valueChanges.subscribe(() => {
+                    c.updateValueAndValidity();
+                    subscription.unsubscribe();
+                });
+            }
+            return controlToCompare && controlToCompare.value !== c.value ? {'notequal': true} : null;
+        };
+    }
+}