Is there any way to restrict characters in ionic input type=text or number

[robinyo]

Try:

  public onKeyUp(event: any) {

    let newValue = event.target.value;

    let regExp = new RegExp('^[A-Za-z0-9? ]+$');

    if (! regExp.test(newValue)) {
      event.target.value = newValue.slice(0, -1);
    }
  }

See:

• Restrict entry to alphanumeric characters and space for Ion Input in Ionic
• https://robferguson.org/blog/2017/11/19/ionic-3-and-forms/
• https://github.com/Robinyo/big-top/blob/master/src/pages/sign-in/sign-in.ts