validate numeric fields with regexp

Question

I'm trying to use regExp to validate an input.

The input should have a numeric field, with not more than 3 digits before the comma and not more than 2 digits after the comma.

I tried this regexp : [0-9]{1,3}([.|,][0-9]{1,2})?

But it does not work. The value 1234.567 is validated as ok although it should not.

Here the code i used to try this :

<html>
<head>
<meta charset="utf-8">
<title></title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<script src="js/test.js"></script>
</head>
<body>

<input id="regExp1" type="text" value = "[0-9]{1,3}([\.|,][0-9]{1,2})?" />
<input type="button" value="->" onclick="applyRegExp(regExp1,test1)"> 
<input id="test1" type="text" />
<input type="button" onclick="TestRegExp(test1,test1Result)" value="test"> 
<div id="test1Result" ></div>

</body>
</html>

///.. test.js :
function applyRegExp(input1,input2){

    input2.pattern = input1.value;
}



    function TestRegExp( inputField,resultField){

        var regexp = new RegExp(inputField.pattern);
        var value = inputField.value;

        if (regexp.test(value)){
            resultField.innerHTML = inputField.name + " ok";
        }else
        {
            resultField.innerHTML = inputField.name + " not ok";
        }

    }

a-d · Accepted Answer · 2014-02-05 10:18:24Z

1

This might be what you want

^\d{1,3}([.|,]\d{1,2})?$

UPDATE: We just check for the string to match from the beginning to the end (with ^ and $)

. What is going on is just we allow 3 digits in a row (any), accept a dot or a comma but excpect with it at least 1 digit and at most 2.

edited Feb 5, 2014 at 10:18

answered Feb 5, 2014 at 10:12

a-d

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1 Comment

Pavlo Over a year ago

A little explanation would help.

score 1 · Accepted Answer · 2014-02-05 10:32:47Z

1

Try this

^\d{1,3}([.|,]\d{1,2})?$

Regular expression visualization

edited Feb 5, 2014 at 10:32

answered Feb 5, 2014 at 10:14

user2587132

2 Comments

a-d Over a year ago

This expects a float only

user2587132 Over a year ago

@aduch, Didnt notice the quantifier in quesn , Thanks :)

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