Develop Reference

How to fetch text using reg exp in javascript

i need to fetch the text after / from the below code.How to achieve this one.I tried to find '/' location or index value by search() but it didn't worked.The scenario is i need to fetch the text which consists 2 parts as 'Username / some text'. Where user name is dynamic and i need text after the '/'
in HTML it looks like this (for one instance)
<a id="open_0" class="search-result-heading" data-gistname="15b6402d51d897f2ed29" "="" href="http://127.0.0.1:8080/edit.html?notebook=15b6402d51d897f2ed29">tejas1493 / ZZZZ</a>
i able to fetchText for the above but after fetching i need the ' / ZZZZ ' text

Try this one...it might work. output will be ZZZZ.
path = "path of the selector";
var pos = path.lastIndexOf("/");
var name = path.substring(pos+1 , date.length-1);

You can make it without regular expressions with a simple search as you described :
var text = document.getElementById('open_0').innerHtml;
var slash_index = text.search("/");
var first_word = text.substring(0, slash_index);
var second_word = text.substring(slash_index+1);

Running the below code will give you the contents in place of ZZZZ where Z can be a digit, uppercase letter or a lowercase letter.
raw_text = document.getElementById('open_0').innerHTML;
text = raw_text.match(/\/[ ]*[0-9a-zA-Z]+/)[0].match(/[0-9a-zA-Z]+/)[0];
alert(text);
Output: ZZZZ
NOTE: It will show the string all the way to the end of the text within that tag and not just 4 characters (if there are more characters).

passing a variable to map & replace

I am trying to "clean" a text string that looks something like this:
DATABASE:madsat NL:Show all platforms of Salute generated from NAIs with no go mobility.
The cleaned string should look like this:
Show all platforms of Salute generated from NAIs with no go mobility.
I am trying the following code but it doesn't seem to like it when I pass in a variable as the string gets returned unchanged:
$(document).ready(function(){
$.get('inputQueryExamples.txt',function(data){
var queryString = data;
var cleanString = "";
var db = '';
$('#database-list').change(function(){
db = $('#database-list').val();
// /(^DATABASE:.*\r\n)(^NL.*)/gm
// http://regex101.com/r/mN4hS2
regex = new RegExp('(^DATABASE:'+ db +'\r\n)(^NL.*)' ,'gm');
console.log(db);
console.log(regex);
//put code in here to replace un-needed stuff
$('#what').append(regex + '<br>');
cleanString = queryString.match(regex);
var nlString = cleanString.map(function(el) {return el.replace('DATABASE:' + db + ' NL:','');});
for (i=0; i<nlString.length; i++){
$('#what').append(nlString[i]+'<br>');
}
}); // end change
Any insight into what i am doing wrong will be appreciated. Thanks

So this works, but I am not sure why I have to process the string twice. Can anyone explain?
var nlString = cleanString.map(function(el) {return el.replace('DATABASE:' + db,'');});
nlString = nlString.map(function(el){return el.replace('NL:',''); });

Something like this?
var s = "DATABASE:madsat \r\nNL:Show all platforms of Salute generated from NAIs with no go mobility.";
var db = "madsat";
var r = new RegExp('(^DATABASE:'+ db + '[\\s\\r\\n]*)(^NL:)' ,'gm');
s1.replace(r, "");
//=> "Show all platforms of Salute generated from NAIs with no go mobility."
Update
It took a while for what you're trying to do to sink in (and your sample data was pretty buried in that regex101 link.)
But I think this JSBin is something close to what you want to do: It still does one pass to find the matches, and a second one to remove the unwanted parts of that match. But the second pass is handled by a single regex replace call rather than your double replaces above. (Click the "Run with JS" button and enter "madsat" or "geoquery" in the box.)
This is the relevant code:
$(document).ready(function() {
$.ajax('http://jsbin.com/fase/1.js', {dataType:'text'}).done(function(data){
var $what = $("#what");
$('#database-list').change(function(){
var db = $(this).val(),
base = '(^DATABASE:'+ db + '[\\s\\r\\n]*)(^NL:)';
var regex1 = new RegExp(base + '(.*)' ,'gm');
var regex2 = new RegExp(base, 'gm');
(data.match(regex1) || []).map(function(str) {
return str.replace(regex2, "");
}).forEach(function(query) {
$what.append(query + "<br/>");
});
});
});
});
Note that the two regexes are identical except that the first one matches the remainder of the "NL:"-line, and the second one doesn't.

How can I find a specific string and replace based on character?

I'm trying to find a specific character, for example '?' and then remove all text behind the char until I hit a whitespace.
So that:
var string = '?What is going on here?';
Then the new string would be: 'is going on here';
I have been using this:
var mod_content = content.substring(content.indexOf(' ') + 1);
But this is not valid anymore, since the specific string also can be in the middle of a string also.
I haven't really tried anything but this. I have no idea at all how to do it.

use:
string = string.replace(/\?\S*\s+/g, '');
Update:
If want to remove the last ? too, then use
string = string.replace(/\?\S*\s*/g, '');

var firstBit = str.split("?");
var bityouWant = firstBit.substring(firstBit.indexOf(' ') + 1);

Concatenating with Regular Expressions

I have a JQuery function that grabs the URL path and adds it as a body class as such:
var pathname = window.location.pathname;
var pathSlashesReplaced = pathname.replace(/\//g, " ");
var pathSlashesReplacedNoFirstDash = pathSlashesReplaced.replace(" ","");
var newClass = pathSlashesReplacedNoFirstDash.replace(/\(\d*\)/g, '').replace(/\s/, '-');
$("body").addClass(newClass);
if ( $("body").attr("class") == "")
{
$("body").addClass("class");
}
.. so if the url is something like /myapp/user/list, the body class ends up as:
<body class="myapp-user list">
The issue is I would like to have all three words with dashes so it should be:
<body class="myapp-user-list">
.. and then I can theme using the CSS:
.myapp-user-list {
}
I am pretty sure there is an issue with my RegEx but I cannot figure out where. I tried various text functions but then the problem was that it grabbed all the text from the page and put that in as the body class:
var text = $(this).text();
var newClass = $.trim(text.replace(/\(\d*\)/g, '').toLowerCase()).replace(/\s/, '-');

Try :
var newClass = location.pathname.split('/').join('-').replace(/(^-|-$)/g,''),
$body = $("body").addClass(newClass);
if ($body.attr("class") == "") {
$body.addClass("class");
}
I would avoid the class name class. It could give problems.

Try adding g modifier to the second replace to replace all white spaces and not just the first.
var newClass = pathSlashesReplacedNoFirstDash.replace(/\(\d*\)/g, '').replace(/\s/g, '-');

I think that applying these two regexps will do the job.
"/\//-/g" Will change all slashes to -
"/-//" Will only remove the first -

What regex can I use to extract the URL from an HTTP <a> element?

Here is the Original string :
var str = " a vartiable";
and I need this part:
str = "https://sjobs.brassring.com/1033/ASP/TG/cim_jobdetail.asp?SID=^cJgiKPhGBHyn5VRSb9gbJg0K2T88FrLqHyAtd6hd5pJ7JeXxNyq0VatKCq3jYWp/&jobId=385594&type=hotjobs&JobReqLang=141&JobSiteId=5239&JobSiteInfo=385594_5239&GQId=0";
In other words, I need to remove the tag <a> and the document.href value
Thanks guys.

How about:
var str = " a vartiable";
str.replace(/^<a href="(https.*?)cim_home\.asp.*?'(cim_jobdetail\.asp.*)'.*$/, "$1$2");
produces:
"https://sjobs.brassring.com/1033/ASP/TG/cim_jobdetail.asp?SID=^cJgiKPhGBHyn5VRSb9gbJg0K2T88FrLqHyAtd6hd5pJ7JeXxNyq0VatKCq3jYWp/&jobId=385594&type=hotjobs&JobReqLang=141&JobSiteId=5239&JobSiteInfo=385594_5239&GQId=0"

Something simple like the following should work...
href="(.*?)"

here's the code u want:
var str = ' a vartiable'
var url = /\"(.*?)\"/str
that's how you match, here's how you strip it out:
str.replace(/\"(.*?)\"/, "$1");
the \"(.*?)\" gives the first minimal set of characters between two " characters the id of $1 then the second argument to the replace function tells it to replace the whole string with what's contained in $1
Also, if you use jQuery, this becomes pretty trivial:
var url = $("a").attr("href");