src/app/shared/utility/validation.service.ts

 /********************************************************************************
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/
import { Injectable } from '@angular/core';
import {
  FormControl,
  FormGroup
}                     from '@angular/forms';
@Injectable()
export class ValidationService {

  /**
   * Validates email address
   *
   * @param formControl
   */
  public validateEmail(formControl: FormControl): {[error: string]: any} {
    let EMAIL_REGEXP = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return EMAIL_REGEXP.test(formControl.value) ? null : { validateEmail: { valid: false } };
  }

  /**
   * Validates required numeric values
   *
   * @param formControl
   */
  public numericRequired(formControl: FormControl): {[error: string]: any} {
    return (formControl.value && formControl.value > 0) ? null : { numericRequired: { valid: false } };
  }

  /**
   * Validates matching string values
   *
   * @param controlKey
   * @param matchingControlKey
   */
  public matchingPasswords(controlKey: string, matchingControlKey: string): {[error: string]: any} {
    return (group: FormGroup): {[key: string]: any} => {
      if (group.controls[controlKey].value !== group.controls[matchingControlKey].value) {
        return { mismatch: { valid: false } };
      }
    }
  }
}