Regular Expression For Ussd Code In Javascript

My text box should only allow valid ussd code Starts with * Ends with # And in the middle only * , # and 0-9 should be allow.

Solution 1:

You can try following regex:

/^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/

Rules

• Starts with *
• Can have 0-9, *, #
• Must have at least 1 number
• Ends with #

functionvalidateUSSD(str){
  var regex = /^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/;
  var valid= regex.test(str);
  console.log(str, valid)
  return valid;
}

functionhandleClick(){
  var val = document.getElementById("ussdNo").value;
  validateUSSD(val)
}

functionsamlpeTests(){
  validateUSSD("*12344#");
  validateUSSD("*#");
  validateUSSD("****#");
  validateUSSD("12344#");
  validateUSSD("*12344");
  validateUSSD("****5###");
}

samlpeTests();

<inputtype="text"id="ussdNo" /><buttononclick="handleClick()">Validate USSD</button>

Solution 2:

You can use the following Regex:

^\*[0-9]+([0-9*#])*#$

The above regex checks for the following:

1. String that begins with a *.
2. Followed by at least one instance of digits and optionally * or #.
3. Ends with a #.

---

In Java script, you can use this to quickly test it out:

javascript:alert(/^\*[0-9]+([0-9*#])*#$/.test('*06*#'));

---

Hope this helps!

Solution 3:

This should work /^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/

ussd = "*123#";
console.log((/^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/).test(ussd));

ussd = "123#";
console.log((/^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/).test(ussd));

Solution 4:

Check here it will work for you

• Starts with *
• Ends with #
• can contain *,#, digits
• Atleast one number

functionvalidate(elm){
  val = elm.value;
  if(/^\*[\*\#]*\d+[\*\#]*\#$/.test(val)){
    void(0);
  }
  else{
    alert("Enter Valid value");
  }
}

<inputtype="text"onblur="validate(this);" />