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js Split array add space between words (not first)

I have a string Topic: Computer Science
And want to strip out topic: (but in fact I want this to work with any header on the string line) and return Computer Science.
I thought about splitting the components and then adding the spaces back in:
var subjectLine = thisLine.split(" ");
var subjectString = "";
for (i = 1; i < subjectLine.length; i++) {
subjectString += subjectLine[i] + " ";
}
But then I need to remove the last space from the string.
For each doesn't work as I need to NOT have the first element appended.
I'm not sure how to do this in js so it is reusable for many different lines and topic names that can come from the subjectLine

After splitting the line, remove the first element from the array, then join the rest back together.
var thisLine = "Topic: Computer Science";
var subjectLine = thisLine.split(" ");
subjectLine.splice(0, 1);
var subjectString = subjectLine.join(" ");
console.log(subjectString);

You might consider using a regular expression, it'll probably be a lot easier than working with arrays: match the non-space characters at the beginning of the string, followed by at least one space, and .replace with the empty string:
const subjectString = thisLine.replace(/^\S+\s+/, '');
const transform = line => line.replace(/^\S+\s+/, '');
console.log(transform('Topic: Computer Science'));

You need to know where the heading stops and the real data starts. Then delete all characters up to that point.
So, for instance, if you know that the heading ends with a colon, then do:
var line = "this is the topic: Computer Science";
var topic = line.replace(/^.*:\s*/, "");
console.log(topic);

Javascript Shortcode Parse

I need to parse following shortcode, for example my shortcode is :
[shortcode one=this two=is three=myshortcode]
I want to get this, is and myshortcode and add to array so it will :
['this', 'is', 'myshortcode']
NOTE : I know generally shortcode parameter marked with " and " ( ie [shortcode one="this" two="is" three="myshortcode"] ), but I need to parse shortcode above without ""
Any help really appreciated

I'm assuming you want to parse the first string with Regex and output the three elements in order to add them to an array later. That seems rather simple, or am I misunderstanding what you need? I'm assuming the word shortcodeis as it will be in your string. You'd probably need two regex operations if you haven't located and isolated the shortcode string yet that you posted above:
/\[shortcode((?: \S+=\S+)+)\]/
Replacement: "$1"
If you already have the code exactly as you posted it, then you can skip the regex above. At any rate, you'll have end with the following regex:
/ \S+=(\S+)(?:$| )/g
You can then add all the matches to your array.
If this is is not what you're looking for, then perhaps a more real example of your code would help.

Here you go I have built a perfectly scalable solution for you. The solution works for any number of parameters.
function myFunction() {
var str = "[shortcode one=this two=is three=myshortcode hello=sdfksj]";
var output = new Array();
var res = str.split("=");
for (i = 1; i < res.length; i++) {
var temp = res[i].split(" ");
if(i == res.length-1){
temp[0] = temp[0].substring(0,temp[0].length-1);
}
output.push(temp[0]);
}
document.getElementById("demo").innerHTML = output;
}
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>

var str="[shortcode one=this two=is three=myshortcode]";
eval('var obj=' + str.replace(/shortcode /,"").replace(/=/g,"':'").replace(/\[/g,"{'").replace(/\]/g,"'}").replace(/ /g,"','"));
var a=[];
for(x in obj) a.push(obj[x]);
console.log(a);
You can try the above code.

Here's my solution: https://jsfiddle.net/t6rLv74u/
Firstly, remove the [shortcode and trailing ]
Next, split the result by space " "
After that, run through the array and remove anything that's on and before =, .*?=.
And now you have your result.

Trying to add linebreaks to every found pattern in string

I have a long string of email addresses, and I need to add a line break to the end of every ".edu" in javascript and write it to the innerHTML of a I'm not very sure how to do this though. Any thoughts?

Assuming that you don't have any separator you can use the '.edu' as a separator because you know that It will be founded in any email you have, so you can try something like this:
JS
var str = 'mail1#mail1.edumail2#mail2.edumail3#mail.edumail4#mail4.edumail5#mail5.edu';
var emails = str.split('.edu');
var result = document.getElementById('result');
for(var i = 0, len = emails.length; i < len; i++){
if(emails[i]){
result.innerHTML += '<p>'+ emails[i] +'.edu</p>';
}
}
HTML
<div id="result">
</div>
I don't know exactly what you mean about a 'line break' but this solution fits for what you need, you just need to replace the string that is placed in the result div for the whatever you want show.
Check out this codepen.

Overflowed text with html in another div

I want to have a text that overflows in another div, so I found and used this answer from another question at Stackoverflow.
The problem is that only plain text is displayed; links, bold/italics and paragraphs are ignored.
Here is the same jsfiddle from the answer, but with added html tags. How do i get to display them?
Code:
var currentCol = $('.col:first');
var text = currentCol.text();
currentCol.text('');
var wordArray=text.split(' ');
$.fn.hasOverflow = function() {
var div= document.getElementById( $(this).attr('id') );
return div.scrollHeight>div.clientHeight;
};
for ( var x = 0; x < wordArray.length; x++ ) {
var word = wordArray[x];
currentCol.append(word+' ');
if ( currentCol.hasOverflow() ) {
currentCol = currentCol.next('.col');
}
}
Any tips or advice will be appreciated :)

jQuery .text method returns only plain text. Try using .html instead.
Example:
var text = currentCol.html();
But if your tags contain any spaces (like <span class="some-class">) then the following line from your code will do a mess with your text
var wordArray=text.split(' ');
You might want to change it to
text = text.replace(/ (?![^<>]*>)/gi, '%^%');
var wordArray = text.split('%^%');
This is kind of workaround since you could iterate over each regex match and substring it on every space character but IMHO the above idea with %^% combination is much more simple. you can replace those 3 signs with anything you want. I just thought it is unique enough that won't be used in any other purpose.
Above regular expression is simplified and assumes that you don't use < and > signs in your text.
If you actually do I would recommend to replace them with < and > anyway.

Split in to Sentences and Wrap With Tags

I'm trying to build a text fixing page for normalising text written in all capital letters, all lower case or an ungrammatical mixture of both.
What I'm currently trying to do is write a regular expression to find all full stops, question marks and line breaks, then split the string in to various strings containing all of the words up to and including each full stop.
Then I'm going to wrap them with <span> tags and use CSS :first-letter and text-transform:capitalize; to capitalise the first letter of each sentence.
The last stage will be writing a dictionary function to find user-specified words for capitalisation.
This question only concerns the part about writing a regex and splitting in to strings.
I've tried too many methods to post here, with varying results, but here's my current attempt:
for(var i=0; i < DoIt.length; i++){
DoIt[i].onclick = function(){
var offendingtext = input.value.toString();
var keeplinebreaks = offendingtext.replace(/\r?\n/g, '<br />');
var smalltext = keeplinebreaks.toLowerCase();
//split at each character I specify
var breakitup = smalltext.split(/[/.?\r\n]/g);
breakitup.forEach(function(i){
var i;
console.log(i);
var packagedtogo = document.createElement('span');
packagedtogo.className = 'sentence';
packagedtogo.innerHTML = breakitup[i];
output.appendChild(packagedtogo);
i++;
});
}
}
It was splitting at the right places before, but it was printing undefined in the output area between the tags. I've been at this for days, please could someone give me a hand.
How can I split a string in to multiple string sentences, and then wrap each string with html tags?

Your regex for the split is fine. Just forgot to escape a few characters:
var str = "SDFDSFDSF?sdf dsf sdfdsf. sdfdsfsdfdsfdsfdsfdsfsdfdsf sdf."
str.split( (/[\.\?\r\n]/g))
//["SDFDSFDSF", "sdf dsf sdfdsf", " sdfdsfsdfdsfdsfdsfdsfsdfdsf sdf", ""]
Use for each iteration capabilities like this:
breakitup.forEach(function(element){
var packagedtogo = document.createElement('span');
packagedtogo.className = 'sentence';
packagedtogo.innerHTML = element;//breakitup is undefiend
output.appendChild(packagedtogo);
//No need to increase index
});