JavaScript - Regular Expression

can anyone explain me in detail what this regular expression mean...
each and every part of this sentence:
var baseRegex = new RegExp("^(?=.{6,})(?=.*^[A-Za-z]([a-zA-Z0-9_-]+)$)(?=.*[A-Z])");

Hi,
Can someone fix the following regular expression? It is validating every thing expect YEAR. It only matches first 2 digits for year instead of 4. I want it to be 4 digits for a year. It returns true if I put 12/25/19.I want it to return false for the above date.

Code:

var RegExPattern = /^(?=\d)(?:(?:(?:(?:(?:0?[13578]|1[02])(\/|-|\.)31)\1|(?:(?:0?[1,3-9]|1[0-2])(\/|-|\.)(?:29|30)\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})|(?:0?2(\/|-|\.)29\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))|(?:(?:0?[1-9])|(?:1[0-2]))(\/|-|\.)(?:0?[1-9]|1\d|2[0-8])\4(?:(?:1[6-9]|[2-9]\d)?\d{2}))($|\ (?=\d)))?(((0?[1-9]|1[012])(:[0-5]\d){0,2}(\ [AP]M))|([01]\d|2[0-3])(:[0-5]\d){1,2})?$/;

Thanks

I am trying to find the correct regular expression (or an alternate) for if a user enter any more than 1-3 digits in the age field of a form it produces an error message. I already have the error set up, just the correct coding to produce the 1-3 digit condition.
Thanks, KWIKCUCUMBER.

for the character classes [ ] ,
if i want to match ,.[] i cannot put them into the square brackets so how to deal with that? what if the characters are . or ! or ." (<-- combined) it fails if the regexp is [.!(.")] which will treat ( as one of the element.

also the book javascript: the definitive guide says that (?=p) requires that the following characters match the pattern p, but do not include those characters in the match. However, the browser failed to figure this out (IE8)
i.e. "asd:ert".match(/(?=\\w/) returns null

thx in advance

Hi i am using this form to validate my input
Code:

function validateForm() {
	var name = document.getElementById("name");
	var descp = document.getElementById("descp");
	var language = document.getElementById("language");
	var txtFileName = document.getElementById("txtFileName");
	var alphaNumExp = /^[a-zA-Z0-9 _-]+$/;
	var isValid = true;
	if ((name.value === "" || name.value.length < 1 || name.value.length > 30) && !name.value.match(alphaNumExp)) {
		isValid = false;
	}
	if ((descp.value === "" || descp.value.length < 1 || descp.value.length > 1000) && !descp.value.match(alphaNumExp)) {
		isValid = false;
	}
	if (language.value === "") {
		isValid = false;
	}
	if (txtFileName.value === "") {
		isValid = false;
	}
	
	document.getElementById("btnSubmit").disabled = !isValid;

}

for a form. It checks everything else correctly EXCEPT for the alpha numeric part. Any ideas?? I am new to JS writing on my own(just was using other's scripts)

Im sorry im tired and cant think how to put this.

how do i make \\1 and \\2 = margin-bottom[^;]+); and margin-top[^;]+);

Sorry again,

Regards.

Code:

var regep = /margin-bottom:([^;]+); margin-left:0px; margin-right:0px; margin-top:([^;]+);/;

elementCSS = elementCSS.replace( regep , "margin-bottom:\\1; margin-left:auto; margin-right:auto; margin-top:\\2;");

Hi all,

As I scan each line of data that was entered into a textarea box, I need to call a function once I come across a line that starts with the following:

Code:

"0 B3C  0020365077 0045740301 3 09FEB2008 09MAR2010 " (without quotes)

I have created the following legend to help with the creating a regular expression that will validate when I have found a line that needs further processing:

N - number
L - letter
A - letter or number
S - space

So using the above legend, the first 51 characters of the line that I need to validate should always be in the following format:

Code:

"NSAAASSAAAAAAAAAASNNNNNNNNNNSASNNLLLNNNNSNNLLLNNNNS" (once again, without the quotes)

I have been reading a few articles on JavaScript regular expressions but am a bit lost at this point as how to start?

Hi Guys,

I am new to this forum, and new to the coding world, hopefully you guys will be able to help me get a little bit further in my little project.

I am attempting to parse a string that is returned when I ask a device for some metadata information, now the information that is returned looks like this,

Code:

RESPONSE "<DIDL-Lite xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/" xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/"><item id="" parentID="" restricted="True"><dc:title>Una - Angels At My Door</dc:title><upnp:class>object.item</upnp:class></item></DIDL-Lite>"

,the part in bold and underlined is the piece of text I want, now previously I have done this with some framing, but that doesn't include the same characters multiple times.

Am I on the right track in believing using a Regular Expression Object is my solution ?

If so how do I go about that ? If someone could give me some advice or point me in the right direction it would be most greatly appreciated !

Thank you very much in advance !

I have a function that changes the label on a set of labels with similar "for" fields. Somehow, the matching is only matching every other label. I suspect I must be missing something obvious.

The goal is to change the text of a set of radio buttons to either "top" and "bottom" or "left" and "right" depending on orientation.

Code:

function ChangeLabels(orientation) {
	var lefttop = 	"Left";
	var bottomright = 	"Right";
    var lbls = document.getElementsByTagName("label");
    var lefttopregex = new RegExp ("Field6_[0-9]+", "gi");
    var bottomrightregex = new RegExp ("Field20_","gi");
    
    
    if (orientation == "Vertical") {
    	lefttop = "Top";
    	bottomright = "Bottom";
    }

  var forvalue = "";
  for (var i=0,k=lbls.length; i<k; i++) {
     	forvalue = lbls[i].htmlFor;
    
   	if (lefttopregex.test(forvalue)) {
      		lbls[i].innerHTML = lefttop;
    }
   	if (bottomrightregex.test(forvalue)) {
      		lbls[i].innerHTML = bottomright;
    }
     
  }	
	
}

And here is the HTML of the labels.

Code:

<li id="fo1li6" class="     ">
<label class="desc" id="title6" for="Field6_0">
Left/Top
<span id="req_6" class="req">*</span>
</label>
<div>
<input id="radioDefault_6" name="Field6" type="hidden" value="" />
<span>
<input id="Field6_0" name="Field6" type="radio" class="field radio" value="Dogs" tabindex="20" onchange="handleInput(this);"  checked="checked" />
<label class="choice" for="Field6_0" >
Dogs</label>
</span>
<span>
<input id="Field6_1" name="Field6" type="radio" class="field radio" value="Pineapple" tabindex="21" onchange="handleInput(this);" />
<label class="choice" for="Field6_1" >
Pineapple</label>
</span>
<span>
<input id="Field6_2" name="Field6" type="radio" class="field radio" value="Leaves" tabindex="22" onchange="handleInput(this);" />
<label class="choice" for="Field6_2" >
Leaves</label>
</span>
<span>
<input id="Field6_3" name="Field6" type="radio" class="field radio" value="Cat" tabindex="23" onchange="handleInput(this);" />
<label class="choice" for="Field6_3" >
Cat</label>
</span>
<span>
<input id="Field6_4" name="Field6" type="radio" class="field radio" value="Star" tabindex="24" onchange="handleInput(this);" />
<label class="choice" for="Field6_4" >
Star</label>
</span>
<span>
<input id="Field6_5" name="Field6" type="radio" class="field radio" value="Bamboo &amp; Sun" tabindex="25" onchange="handleInput(this);" />
<label class="choice" for="Field6_5" >
Bamboo & Sun</label>
</span>
<span>
<input id="Field6_6" name="Field6" type="radio" class="field radio" value="Bamboo" tabindex="26" onchange="handleInput(this);" />
<label class="choice" for="Field6_6" >
Bamboo</label>
</span>
<span>
<input id="Field6_7" name="Field6" type="radio" class="field radio" value="Sun &amp; Moon" tabindex="27" onchange="handleInput(this);" />
<label class="choice" for="Field6_7" >
Sun & Moon</label>
</span>
<span>
<input id="Field6_8" name="Field6" type="radio" class="field radio" value="Fleur de lis" tabindex="28" onchange="handleInput(this);" />
<label class="choice" for="Field6_8" >
Fleur de lis</label>
</span>
<span>
<input id="Field6_9" name="Field6" type="radio" class="field radio" value="Dragonflies" tabindex="29" onchange="handleInput(this);" />
<label class="choice" for="Field6_9" >
Dragonflies</label>
</span>
<span>
<input id="Field6_10" name="Field6" type="radio" class="field radio" value="No Design" tabindex="30" onchange="handleInput(this);" />
<label class="choice" for="Field6_10" >
No Design</label>
</span>
</div>
</li>

I want a regular expression for Citi where first character should not be a blank space.

Thanks in advance

Me again, having some issues with the following code...

PHP Code:
if (str.match(regEx)) {
       alert("illegal character");
} 


regEx = /[^0-9a-zA-z]/g

I have tried typing in loads of strings, and nothing is causing the alert to work.

Edit: Fixed it, it seems the fix is:
regEx = [^0-9a-zA-z]

I thought you need the /. I also can't use any modifiers, although it works fine without them.

I'm trying to convert a line using a regular expression.

The re I am using is this: <div><span>&middot;<span>[\s*]<\/span><\/span>([^<]*)<\/div>

I'm using the expression in the replace function like this:

html = html.replace( /<div><span>&middot;<span>[\s*]<\/span><\/span>([^<]*)<\/div>/gi,'<li>$1</li>') ;

the line of code I am changing is like this:

<div><span>&middot;<span> </span></span>Illness - where a pupil is too ill to leave the house</div>

eg it should strip out the code and leave <li>Illness - where a pupil is too ill to leave the house</li>

it works fine here http://www.regular-expressions.info/...ptexample.html
but when used with the replace command it does not?

Can anyone see the problem?

(I'm trying to convert bullet points from word)

Darren

The following code removes the brackets and a dash from the string variable.
I am interested why there are \ in front of each bracket in the regular expression regexp?
The code work fine if regexp would be /()-/g;
So why then / is necessary? I would appreciate a lot with someone could explain.
Thank you very much.

<html>
<head>
<title>Regular Expressions</title>
<script type="text/javascript">
var string="(304)434-5454";
regexp=/[\(\)-]/g;
document.write(string.replace(regexp, ""));
</script>
</head>
<body>
</body>
</html>

Hi guys,

May i know how to write this string (1,2,4-6,9,11-13,20) in regular expression?

Restrictions:-
1) Only numbers, comma and hyphen are allowed
2) no spaces are allowed

Thanks much!

Dear all,

I have only a very basic knowledge of Javascript, and even less than that with regards to Regular Expressions.

I've written a simple script in JS designed to "highlight" a navigation bar item when you're on the page it is linking to.

For example, if you click on "contact us" from the navigation bar, then once the contact page opens, the "contact us" link on the navigation bar will be highlighted.

My approach is very basic:

Code:

var url = window.location.href;

if (url.match("contactus.htm")) {
     ... highlight code...
}

This works fine, with one exception: the "default.asp" page!

If the URL in the address bar is: "http://www.mysite.com/default.asp", then the above method will work just fine.

However, when someone enters my site directly, the URL in the address bar is "http://www.mysite.com/", with the "default.asp" not being present.

Now on first thought the solution to this would be to simply modify the script like this:

Code:

var url = window.location.href;

if (url.match("default.asp") || url.match("http://www.mysite.com/")) {
     ... highlight code...
}

But that won't work since the "http://www.mysite.com/" part is in common to all sub pages on my site.

Also the default.asp page sometimes takes in query string variables e.g. "http://www.mysite.com/?ref=alex" or "http://www.mysite.com/default.asp?ref=alex".

Now obviously the solution is to use regular expressions in order to define the specific conditions for the script:

1. If the url is "http://www.mysite.com/" without anything after the last "/" then highlight the "home page" item in the navigation bar.
2. If the url is "http://www.mysite.com/?[...]" then also highlight the "home page" item in the navigation bar.
3. Same goes for "http://www.mysite.com/default.asp?[...]".
4. Additionally, taking into account that the URL can also begin with "https://secure." instead of "http://www.", with rules 1-3 applying to it as well.

Unfortunately since I'm a total newbie when it comes to regular expressions, I have no idea where to start with this! I've tried reading some tutorials on Regular Expressions but other than the basic examples I didn't really understand how to do what I want to do.

For any of you Javascript experts on here this would be extremely easy, and I would REALLY REALLY appreciate your help!!

Thank you for your time!!

nanquan