javascript - Check whether text field contains numbers only and has to be 11 digits - Stack Overflow

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I have this function to check whether the text field contains numbers only, if there are letters in this field then an error should show

//Tel Validate
function is_valid_tel() {
 $this = $("#inputTel");
 var pattern = new RegExp("^[0-9]*$");
if(pattern.test($this.val())){ // valid
 if ($this.closest(".control-group").hasClass("error"))
  $this.closest(".control-group").removeClass("error");
  $this.siblings(".help-inline").css("display", "none");
return true;
} else { // error
 if (!$this.closest(".control-group").hasClass("error"))
  $this.closest(".control-group").addClass("error");
  $this.siblings(".help-inline").css("display", "block");
  return false;
 }
}

When i enter letters into the text field i get no error thrown. My jquery/javascript is limited but I thought this would at least work? as the reg exp checks for numbers between 0-9. I would also like to check that if a number is entered then it matches 11 digits

Any help appreciated thanks

I have this function to check whether the text field contains numbers only, if there are letters in this field then an error should show

//Tel Validate
function is_valid_tel() {
 $this = $("#inputTel");
 var pattern = new RegExp("^[0-9]*$");
if(pattern.test($this.val())){ // valid
 if ($this.closest(".control-group").hasClass("error"))
  $this.closest(".control-group").removeClass("error");
  $this.siblings(".help-inline").css("display", "none");
return true;
} else { // error
 if (!$this.closest(".control-group").hasClass("error"))
  $this.closest(".control-group").addClass("error");
  $this.siblings(".help-inline").css("display", "block");
  return false;
 }
}

When i enter letters into the text field i get no error thrown. My jquery/javascript is limited but I thought this would at least work? as the reg exp checks for numbers between 0-9. I would also like to check that if a number is entered then it matches 11 digits

Any help appreciated thanks

• javascript
• jquery
• regex

Share Improve this question Follow asked Feb 6, 2013 at 9:50 RichlewisRichlewis 15.4k3939 gold badges137137 silver badges300300 bronze badges

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2 Answers 2

Sorted by: Reset to default 6

use this regular expression ^\d{11}$

old regex

^ begin of string

[0-9]* 0 or more digits

$ end of string

new regex

^ begin of string

\d{11} 11 digits (\d == [0-9])

$ end of string

Try the following RegExp

var pattern = new RegExp("^[0-9]{11}$");

Which is a more readable version of :

var pattern = new RegExp("^\d{11}$");

You will find a handy reference about special characters here.

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