regular expression validation using javascript

Question

I need to validate a text based upon a regular expression in javascript. My regular expression is working fine but but can't find out why it is not working in java script.

The regular expression is this , ^([-+/*]\d+(\.\d+)?)*

Valid expressions are +7 or +9.36*8 or +4-9.3/5.0

Invalid matches are test or 8.36

Here is the code,

    var ck_diffrentialformula = /^([-+/*]\d+(\.\d+)?)*/;

            function radtxtbxLinkedDifferentialFormulaOnBlur(sender, eventArgs) {
                if (sender.get_value().length > 0) {

                    var entered_value = sender.get_value();

                    if (ck_diffrentialformula.test(entered_value)) {
                     alert('Text Matches');
                    }
                    else {
                     alert('Text does not match');
                    }
                }
            }

sender.get_value() - gives the text box value over here.

Please tell me where I am doing wrong.

Please provide an example of the actual data that needs to be validated (both a valid and an invalid example would be best). — lanzz
– lanzz, Commented Jul 6, 2012 at 6:39
It would help us to know the value of sender.get_value() immensely (and what you expect the alert to be). — Ray Toal
– Ray Toal, Commented Jul 6, 2012 at 6:39
@Sirwani - Yes, but even if I enter the correct format it gives me error message. — Bibhu
– Bibhu, Commented Jul 6, 2012 at 6:40
Your code, exactly as it is, works with absolutely no problems and matches all your test data: jsbin.com/etigug/edit#source — lanzz
– lanzz, Commented Jul 6, 2012 at 6:54

sachleen · Accepted Answer · 2012-07-06 06:43:14Z

2

I'm assuming you're using it something like this:

<input type="text" onchange="radtxtbxLinkedDifferentialFormulaOnBlur(this,null)" />

sender has no method .get_value() so that won't even work. Replacing that, it seems to work.

function radtxtbxLinkedDifferentialFormulaOnBlur(sender, eventArgs) {
    console.log(sender)
    if (sender.value.length > 0) {
        console.log(sender.value);
        if (ck_diffrentialformula.test(sender.value)) {
         console.log('Text Matches');
        }
        else {
         console.log('Text does not match');
        }
    }
}

answered Jul 6, 2012 at 6:43

sachleen

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5 Comments

Bibhu Over a year ago

Updated my question, I am getting the textbox value using 'sender.get_value()' and the value is also coming

sachleen Over a year ago

So sender.getValue() returns the correct value... all you have left is an if statement. Syntax is valid. Something else is wrong. Show us the getvalue code

Bibhu Over a year ago

sender.getValue() returns the correct value i have checked it using an alert box

sachleen Over a year ago

can you alert entered_value?

sachleen Over a year ago

If you can get that far, it should alert something because you have an if and an else... something else is causing this. youll have to share the whole code. I honestly don't understand. your code works as is.

Johannes Egger · Accepted Answer · 2012-07-06 07:00:47Z

1

Maybe you want to try this expression: /^([\-+\/*]\d+(\.\d+)?)*$/
It escapes "-" and "/" (jsbin suggests it) within the regex and considers the whole string ($ at the end).

answered Jul 6, 2012 at 7:00

Johannes Egger

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1 Comment

Bibhu Over a year ago

Thanks, it works just I had to add an extra escape character. The correct regular expression is /^([\-+\/\*]\d+(\.\d+)?)*$/

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