问基于复杂角色和字符位置的输入文本字段验证

EN

import { AbstractControl, ValidationErrors } from "@angular/forms"

export const inputTextValidator = function inputTextValidator(control: AbstractControl): ValidationErrors | null {

  let getErrorObject = function (message): ValidationErrors {
    return {
      inputText: true,
      message // provide custom error message related to the validation role
    }
  }

  let value: string = control.value || '';

  // check if value length between specific range like 7-25
  if (value.length < 7 && value.length < 25) {
    return getErrorObject(`text length must be between 7-25 ,current length ${value.length}`);
  }

  // check if value invalid characters  like #$%^%$^/-+
  let validCharacters = /^[a-zA-Z0-9\*]+$/g
  if (validCharacters.test(value) === false) {
    return getErrorObject(`text has invalid characters,current value ${value.length}`);
  }

  let asterisk = /^\w+\*?$/g
  if (asterisk.test(value) === false) {
    return getErrorObject(`only one asterisk at the end of the string is valid,current value ${value.length}`);
  }

  // check the asterisk postion at 8th-13th 
  let indexOfAsterisk: number = value.indexOf('*'); // index base on 0
  if (indexOfAsterisk >= 0 && (indexOfAsterisk < 8 || indexOfAsterisk > 12)) {
    return getErrorObject(`asterisk must bee in postion at 8 -13 th,current * postion ${indexOfAsterisk}`);
  }

  return null;
}