Why is this JS code matching underscores?

[williamc]

The same regexp that seems to be working on the server side in Perl
seems to be failing on the client side in JavaScript... I want to match
a string that's exactly 7 alpha-numeric characters. So I used...

var reSCode = /^[a-zA-z0-9]{7}$/;

....

if (frm.elements["ServiceCode"].value == "") {
alert("Service Code is a required field.");
return;
} else {
strServiceCode = frm.elements["ServiceCode"].value;
if (!(reSCode.test(strServiceCode))) {
alert("The Service Code that you entered blah blah...");
return;
}
}

However, when the user enters an underscore re.test() seems to be
returning true... Can somebody explain why?

thx,

--williamc

 

[Douglas Crockford]

The same regexp that seems to be working on the server side in Perl

seems to be failing on the client side in JavaScript... I want to match
a string that's exactly 7 alpha-numeric characters. So I used...

var reSCode = /^[a-zA-z0-9]{7}$/;

Too legit to shift.

var reSCode = /^[a-zA-Z0-9]{7}$/;

http://www.crockford.com/javascript/lint.html

 

[williamc]

Too legit to shift.

var reSCode = /^[a-zA-Z0-9]{7}$/;

Say what?



--wmc.

 

[Dana Cartwright]

OK, so "Too legit to shift." is pretty cryptic, but what he correctly
pointed out is that these two lines:

var reSCode = /^[a-zA-z0-9]{7}$/; // Your version
var reSCode = /^[a-zA-Z0-9]{7}$/; // Douglas Crokford's version.

are not the same, and therein lies your problem.

Too legit to shift.

var reSCode = /^[a-zA-Z0-9]{7}$/;

Say what?



--wmc.

 

[williamc]

Doh...

One of those staring right at deals. Altho I still don't know what "Too
legit to shift" means...

thx all,

-wmc...

OK, so "Too legit to shift." is pretty cryptic, but what he correctly
pointed out is that these two lines:

var reSCode = /^[a-zA-z0-9]{7}$/; // Your version
var reSCode = /^[a-zA-Z0-9]{7}$/; // Douglas Crokford's version.

are not the same, and therein lies your problem.

Too legit to shift.

var reSCode = /^[a-zA-Z0-9]{7}$/;

Say what?



--wmc.

 

[Jamie Jackson]

That's when you feel that with your parachute pants, your mind for
rhyme, and your two hype feet, you can't be bothered to hit the
"shift" key.

Jamie ;-)
WebMaster, MCHammerUSA.com
http://www.mchammerusa.com/

Okay, so not really.

Doh...

One of those staring right at deals. Altho I still don't know what "Too
legit to shift" means...

thx all,

-wmc...

OK, so "Too legit to shift." is pretty cryptic, but what he correctly
pointed out is that these two lines:

var reSCode = /^[a-zA-z0-9]{7}$/; // Your version
var reSCode = /^[a-zA-Z0-9]{7}$/; // Douglas Crokford's version.

are not the same, and therein lies your problem.

Douglas Crockford wrote:


Too legit to shift.

var reSCode = /^[a-zA-Z0-9]{7}$/;


Say what?



--wmc.

 

[williamc]

Ok, I'm parting to hit it...

--williamc