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How to replace a text plus brackets

Hi there how can I replace from this to this
var str = document.getElementById('bos').innerHTML.replace('col_nr', "");
document.getElementById('bos').innerHTML = str;
<div id="bos">
col_nr[504]
</div>
I want to be able to take only the number without brackets

You can perform more replace() to achieve your goal, demonstrated as below. Alternatively, you can use regular expression to perform your task as well.
var str = document.getElementById('bos').innerHTML.replace('col_nr[', '').replace(']', '');
document.getElementById('bos').innerHTML = str;
<div id="bos">
col_nr[504]
</div>

You could replace all not number characters.
var element = document.getElementById('bos');
element.innerHTML = element.innerHTML.replace(/\D/g, "");
<div id="bos">
col_nr[504]
</div>

Using javascript/jquery to remove text after a certain character

Is there a way to replace/remove the text only after a certain character using jQuery or Javascript? I want to remove text after the dot '.' from an element.

You can easily do it with .split() like this:
var text = 'daslkdaskldj.asdasdasd';
text.split('.')[0];
here is fiddle

var string = "Test String.Test String 2".split('.')[0];
console.log(string)
Will give you the output:
Test String
Here is a working example:
https://jsfiddle.net/zr2wg90d/

Your question is a bit unclear. But to remove all text after the first '.'(dot) This can do the trick with an input field. There are a lot of ways to achieve this. This is a solution without jQuery.
function removeAfterDot() {
var test = document.getElementById("myInput").value;
alert("String before remove: " + test);
test = test.substr(0, test.indexOf('.'));
alert("String after remove: " + test);
}
<input type="text" id="myInput" onchange=removeAfterDot();>

text.substr(0, text.indexOf('.'));

Hope this helps.
var q = 'https://stackoverflow.com/questions/';
q = q.substring(0, q.indexOf('.'));
alert(q);

Try this
var yourString = "Hello. World";
yourString.substr(0, yourString.indexOf('.'));
Will give you the following output
Hello

you can use this. split any string at the character you give it.
<p>first part . second part</p>
remove
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$('a').click(function(){
var the_string = $('p').text();
var removed = the_string.split('.', 1);
$('p').text(removed);
});
</script>

for me splice works, I basically use this for removing characters after a hyphen or a comma etc.
var text = 'Tellme.more';
text.split('.')[0]);
//Consoles out -> Tellme

How to strip specific tag into div in Javascript?

I have this html code
<div class="myDiv">
My link
<p>This is a paragraph</p>
<script>//This is a script</script>
</div>
And I this javascript:
$('.myDiv').children().each(
function() {
var strToStrip = $('.myDiv').html();
if ( this.tagName != 'A' ) {
// Strip tag element if tagName is not 'A'
// and replace < or > with < or >
strToStrip.replace(/(<([^>]+)>)(?!(a))/ig, "");
}
}
);
How can I strip all tags, except from the a element?
I only need the link and strip tags if it is not a link tag.
I can't find what wrong with this code and what regex can I use to do this.
Any help please?

Try this regex example:
var strToStrip = $('.myDiv').html();
var temp = strToStrip.replace(/<[^a\/][a-z]*>/g, "<");
var result = temp.replace(/<\/[^a][a-z]*>/g, ">");
alert(result);

My goal of this question is to figure out how twitter do his hashtag or usergroup by using # or #. Go here to see the final result

you can use replace method of string using regular expr
var html = $("#main").html();
var result = html.replace(/[\<\>\/]/g,'');
alert(result);
the example shown here

RegEX to replace <div /foo> with </div>

I'm a newbie in using RegEX and I could really use some help.
I'm doing some string replacements and I currently get the output
<div /foo>
Instead of
</div>
str = "[foo][/foo]";
Regex used:
str= str.replace(/\[/g, '<div ').replace(/\]/g, '>');
Output wanted:
<div foo></div>
Can someone help me to replace the string in the right way?
Thank you very much!

Not much content to your question so I just posted something which gets the job done. Note this assumes you do not care about anything after the opening tag, it only keeps the name of the tag and replaces it by </tagname>.
var str = "<div /foo>";
var replaced = str.replace(/<(\w+).*/, '</$1>')
// "</div>"

This one could suit your needs:
\[([^\]]+)\](.*?)\[/\1\]
Replace with: <div $1>$2</div>
Visualization by Debuggex
Demo on RegExr
PS: don't forget to escape the / if using JavaScript's regex literal, i.e.:
/\[([^\]]+)\](.*?)\[\/\1\]/g

How about:
str= str.replace(/\[(.+?)\]\[\/\1\]/g, '<div $1></div>');

You can do like this also.
var str = "[foo][/foo]";
//replace <, > with [, ]
var signReplace = str.replace(/\[/g, '<').replace(/\]/g, '>');
tagReplace = signReplace.replace(/foo/g, 'div'); //replace div with foo

Replacing tab characters in JavaScript

Please consider the following HTML <pre> element:
This is some
example code which
contains tabs
I would like to replace all of the tab characters with four non-breaking space characters in HTML (i.e. ). I have tested the above pre element with JavaScript for the presence of tab characters as follows:
$('pre').ready(function() {
alert(/\t/.test($(this).text()));
});
But it is always returned false. Can anyone tell me the correct process by which to replace tab spaces from the source code to HTML NBSPs? The tabs have been added by Komodo Edit, and are visible when viewing the source.

You can do it like this:
$('pre').html(function() {
return this.innerHTML.replace(/\t/g, ' ');
});
That will loop through all pre elements on the page and call the function for each of them. jQuery's html function uses the return value of the function we give to replace the content of each element. We're using String#replace to replace all (note the g flag on the regexp) tab characters in the HTML string with four non-breaking spaces.
Live example

It removes line breaks, extra spaces and line breaks:
function removeNewlines(str) {
//remove line breaks from str
str = str.replace(/\s{2,}/g, ' ');
str = str.replace(/\t/g, ' ');
str = str.toString().trim().replace(/(\r\n|\n|\r)/g,"");
console.log(str);
}
Demo:
function removeNewlines(str) {
//remove line breaks from str
str = str.replace(/\s{2,}/g, ' ');
str = str.replace(/\t/g, ' ');
str = str.toString().trim().replace(/(\r\n|\n|\r)/g,"");
console.log(str);
}
$('#acceptString').click(function() {
var str = prompt('enter string','');
if(str)
removeNewlines(str)
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='button' value='Enter String' id='acceptString' />

Try this:
var tab = RegExp("\\t", "g");
document.getElementById("text").value =
document.getElementById("text").value.replace(tab,' ');