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How to access flow variables from javascript in power automate

I'm working on a power automate flow and I'm having some trouble. I copied some text to my clipboard in the flow and i asigned it to a variable in my flow. I'm trying to parse the variable using the javascript scripting feature but i'm getting a syntax error whenever I try to use the %variable% syntax in javascript. I used the variable button in the text editor they give you to add the variable to my script but even something simple as var res = %SimResults%; returns an error C:\Users\$me\AppData\Local\Temp\Robin\nkwrgcdoxrp.tmp(1, 11) Microsoft JScript compilation error: Syntax error
It seems that even though I Should be able to access my flow variables from Javascript it throws a syntax error when I try

You'll need to put quotes around it ...
var res = "%SimResults%"
... it treats the variables as more of a find and replace within your Javascript code, therefore, you need to do the work to ensure the correct encapsulation, etc. exists.
This may not solve your problem though depending on the complexity of what is contained within the variable.
If you have additional quotes, etc. you may need to escape them prior to putting them in the Javascript task IF they exist within the string ... just be mindful of that.

Chrome Bookmarklet to Check URL

I am creating a chrome javascript bookmarklet with reference to:
this question
My code:
javascript:(function NoOverrideAction(t){this.currentWindow=t,this.urlMatchPattern=/https:\/\/.*visual\.force\.com\/apex\/.*/,this.urlMatchPattern1=/https:\/\/.*visualforce\.com\/apex\/.*/,null!=this.currentWindow.location.toString().match(this.urlMatchPattern)||null!=this.currentWindow.location.toString().match(this.urlMatchPattern1)?this.isPageValid=!0:this.isPageValid=!1,this.recordId} NoOverrideAction.prototype={getId:function(){this.currentWindow.location.search.substr(1).split("&").forEach(function(t){var i=t.split("=");"id"==i[0]&&(this.recordId=i[1])},this)},run:function(){this.getId(),console.log(this),this.isPageValid&&void 0!==this.recordId&&(this.currentWindow.location.href="https://"+this.currentWindow.location.hostname+"/"+this.recordId+"?nooverride=1")}};var noAction=new NoOverrideAction(window);noAction.run();)();
However, I get following error:
Uncaught SyntaxError: Unexpected identifier
This works well in console but not as a bookmarklet.
I am trying to verify the URL of my current page and replace the URL

Part I.
Several reasons why js-code might work in console, but not work as a bookmarklet.
1 - You don't use the established way of making bookmarklets, i.e. IIFE-functions.
javascript:(function(){
alert('hi');
/*code here*/
})();
2 - If you do use this structure, there might be the problem with comments.
Use /*multi-line comment*/ instead of //single-line comment (because bookmarklet is a one-liner, so you cannot close your comment)
3 - Some problems with semicolons ;.
Don't confuse statements (need semicolon) and assignments (do not need them).
Console has its "automatic semicolon insertion", but it is a problem for a one-lined bookmarklet.
You should read a bit more here: https://stackoverflow.com/a/2717956/5410914
Part II
Since there is no HTML-code to test, it might be hard to check. Moreover, you could have made it easier to read by making it multi-lined (it will still work as a bookmarklet when you paste it as a bookmark). But anyway.
The main reason it might not work is that you don't use IIFE-format (Immediately Invoked Function Expression).
Your code has function NoOverrideAction(t) and, moreover, there is };var noAction=new NoOverrideAction(window);noAction.run();)(); at the end. It is not IIFE.
Read more: https://developer.mozilla.org/ru/docs/Glossary/IIFE
To debug a bookmarklet on your own, since there is no HTML provided, you might try to make your code simplier (even with alert('hi'); at first, and verify the reason it won't start) and then make it more complicated once you figure out that it works.

How to keep "*/" in regular expression from being interpreted as block comment?

I'm working on a bookmarklet which is using the replaceText plugin to wrap all words (and extraneous spaces/punctuation) on a page in span tags. That plugin traverses all the text nodes on a page and allows me to call a function to manipulate the contents of each one without breaking any other HTML formatting on the page. (None of this is the problem, I'm pretty sure, but I felt like the context might be useful). My call of the function looks like this, for your reference:
$("body *").replaceText(/\S+\s*/g, spanWrap);
The problem is that the best regular expression I've found for separating these words for my purposes -- /\S+\s*/g -- contains the characters for the end of a block comment ("*/"). If I add the opening of a block comment a few lines before it in the .js file in Notepad++, I can see that the syntax highlighter is reading it as that.
When I run my bookmarklet, most sites seem to have no problem with this issue and the bookmarklet works as intended. However, some sites, for reasons I can't predict, throw up an "Uncaught SyntaxError: Unexpected token <" error and the bookmarklet breaks/stops running. If I change the regular expression I'm using in the replaceText function to one I had been using in an earlier version of the bookmarklet -- /\b(\S+?)\b/g -- while changing absolutely nothing else in the bookmarklet, these sites stop giving the error and the bookmarklet works just fine, so I have to believe that it's the presence of the block comment closure that's causing it.
For the purposes of what I'm trying to do with the bookmarklet, though, the expression with that comment closure in it --/\S+\s*/g-- works much, much better than the other one, which doesn't catch punctuation and white space. However, I'd also really like it if my bookmarklet didn't break on certain sites.
So, is there either a way to fix the regular expression that I have so that it's not being read as a comment or can you suggest one that can do the same job maybe with a different syntax or something? (If it's not obvious from my question, I have the barest understanding of how regular expressions work and have gotten the ones I'm using in this example by copying them from other Stack Overflow questions/answers)

Use the long version:
var regex = new RegExp("\\S+\\s*", "g");
$("body *").replaceText(regex, spanWrap);
(EDIT: Escaped the backslashes in the string)

So, is there either a way to fix the regular expression that I have so that it's not being read as a comment
I can't think of anything sane. (You could get the effect by using the RegExp constructor and breaking the regex up into two strings and then concatenating them back together for the regex. I wouldn't call that sane though.)
I'd use a series of line comments // instead of a block comment.

Avoid FF JS automatic HTML encoding?

I'm trying to make simple templating for users on a site. I have a test line like this :
<div id="test">Test</div>
It will alert the HTML properly with the following JS in all browsers except FF:
alert( document.getElementById( 'test' ).innerHTML );
In FF it will change the curly braces to their HTML encoded version. I don't want to just URL decode in case the user enters HTML with an actual URL instead of one of the templated ones. Any ideas to solve this outside of REGEXing the return value?
My fiddle is here: http://jsfiddle.net/davestein/ppWkT/
EDIT
Since it's seemingly impossible to avoid the difference in FF, and we're still early in development, we are just going to switch to using [] instead of {}. Marking #Quentin as the correct answer since it's what I'm going by,

When you get the innerHTML of something, you get a serialised representation of the DOM which will include any error recovery or replacing constructs with equivalents that the browser does.
There is no way to get the original source from the DOM.

If your code won't contain %xx elsewhere, you can just run it through unescape().

Is there any documentation on underscores in jquery variable names in IE8?

I was having issues with some jquery and posted about it here. After following a few of the suggestions, I was able to isolate the problem - IE8 did not like the variable name new_email. In fact the debugger had been telling me that the issue was at character 4 of that line, but I couldn't believe it was the variable name, so I kept looking for other issues.
After finally giving in and changing the variable name to newEmail, IE8 no longer blows up - the code works as expected with no errors.
I've been unable to find any documentation stating that you can't use underscores in jquery variable names, and indeed, the code worked correctly in every other browser with the underscore in place. Is this an unwritten rule in IE8? Is it something that real jquery developers just know? I'm worried if this really is true, as I inherited this code, and the app is enormous - I know there are several dozen variables in various places that have underscores in them.

This is actually a javascript variable and not a jQuery variable, an important distinction, and in Javascript the underscore is a valid character for variable names. You must have changed something else unrelated.
Is it possible that variable name was already assigned elsewhere? Also note that you aren't using the var keyword which can cause further issues with scope.
You can always post a jsfiddle.net example if you would like more assistance though.

here is a working jsfiddle that uses your variable
please note that you should probably be more specific than ":text"

jQuery is written in JavaScript, which is a language based on the ECMAScript Language Specification (PDF). The specification states that "underscore[s] are permitted anywhere in [a variable name]".
Your problem, as HurnsMobile, stated is most definitely not with the underscore but some other part of your code. It may also be caused by some quirk or bug in IE8 but even IE8 should be able to handle simple variable names.