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Rewriting javascript regex in php when regex have escapes

I'm trying to write my regex as string (it's part of my S-Expression tokenizer that first split on string, regular expressions and lisp comments and then tokenize stuff between), it works in https://regex101.com/r/nH4kN6/1/ but have problem to write it as string for php.
My JavaScript regex look like this:
var pre_parse_re = /("(?:\\[\S\s]|[^"])*"|\/(?! )[^\/\\]*(?:\\[\S\s][^\/\\]*)*\/[gimy]*(?=\s|\(|\)|$)|;.*)/g;
I've tried to write this regex in php (the one from Regex101 was inside single quote).
$pre_parse_re = "%(\"(?:\\[\\S\\s]|[^\"])*\"|/(?! )[^/\\]*(?:\\[\\S\\s][^/\\]*)*/[gimy]*(?=\\s|\\(|\\)|$)|;.*)%";
My input
'(";()" /;;;/g baz); (baz quux)'
when called:
$parts = preg_split($pre_parse_re, $str, -1,
PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
it should create same array as in Regex101 (3 matches and stuff between) but it keep splitting on first semicolon inside regex /;;;/g

I think your escaping might be incorrect. Try this regex instead:
$pre_parse_re = "%(\"(?:\\\\[\\\\S\\\\s]|[^\"])*\"|\/(?! )[^\/\\\\]*(?:\\\\[\S\s][^\/\\\\]*)*\/[gimy]*(?=\s|\(|\)|$)|;.*)%";
Using preg_split might also return more than the capturing groups that you want, so you could also change to use this if you just want the 3 matches.
$parts;
preg_match_all($pre_parse_re, $str, $parts, PREG_SET_ORDER, 0);

Equivalent regex pattern from c# to javascript

Convertion of the regular expression from C# to javascript.
C#
(?<![\\]);
Javascript
/(?<![\\]);/
While using Regex.split, the regular expression for C# works fine but in javascript 'Unexcpected Quantifier' error occurs.
string
"CN=s\,tttrrr,OU=OU1,DC=dom1,DC=local;CN=g\;hi\,klm,OU=OU1,DC=dom1,DC=local;CN=rrr\ttt,OU=OU1,DC=dom1,DC=local;CN=Vvvv,OU=OU1,DC=dom1,DC=local"
Result
CN=s\,tttrrr,OU=OU1,DC=dom1,DC=local
CN=g\;hi\,klm,OU=OU1,DC=dom1,DC=local
CN=rrr\ttt,OU=OU1,DC=dom1,DC=local
CN=Vvvv,OU=OU1,DC=dom1,DC=local

Splitting the input based on ; which was preceded by a word boundary will give you the desired output.
> var str = "CN=s\\,tttrrr,OU=OU1,DC=dom1,DC=local;CN=g\\;hi\\,klm,OU=OU1,DC=dom1,DC=local;CN=rrr\ttt,OU=OU1,DC=dom1,DC=local;CN=Vvvv,OU=OU1,DC=dom1,DC=local"
undefined
> str.split(/\b;/g)
[ 'CN=s\\,tttrrr,OU=OU1,DC=dom1,DC=local',
'CN=g\\;hi\\,klm,OU=OU1,DC=dom1,DC=local',
'CN=rrr\ttt,OU=OU1,DC=dom1,DC=local',
'CN=Vvvv,OU=OU1,DC=dom1,DC=local' ]
DEMO

split string of chain functions with reg-exp

I looked around on StackOverflow but could not find the answer!
Anyway, I was wondering how do I get following in JavaScript with regexp.
I have a string
bla().func1($(ele).attr("data")).func2.func3("test")... ;
and I want extract func1, func2, func3... from the given string, anybody have an example of how to do that?
Bear in mind, that the function names changes, so they are not func1, func2 ... they can be load, past, moon ... whatever

try this:
var str = 'bla().func1($(ele).attr("data")).func2("test")';
alert(str.split(/(?:\.)\w+\d+(?=\()/g));
There's the fiddle:
http://jsfiddle.net/cv6avhfb/3/
This code would split the string in parts while using as separators substrings like '.func1(', '.func2(', '.abc3(' and other. If the function names have different structure you just have to change the \w+\d+ part of the regex.
Here's the result of this code:
bla(),($(ele).attr("data")),("test")
And if you like to know more about regex in javascript:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

Repeatedly strip out innermost parenthesized expressions:
var str = 'bla().func1($(ele).attr("data")).func2.func3("test")... ';
var expression = /\([^(]*?\)/g;
while (expression.test(str)) { str = str.replace(expression, ''); }
document.write(str.split('.').slice(1).join(' '));
However, you shouldn't do this (why do you want to?). JS should be parsed by, well, JS parsers. For instance, the above will fail miserably if there's a string literal containing a parenthesis. You should parse this using Esprima and analyze the resulting parse tree.

Simple Javascript string manipulation

I have a string that will look something like this:
I'm sorry the code "codehere" is not valid
I need to get the value inside the quotes inside the string. So essentially I need to get the codehere and store it in a variable.
After some researching it looks like I could loop through the string and use .charAt(i) to find the quotes and then pull the string out one character at a time in between the quotes.
However I feel there has to be a simpler solution for this out there. Any input would be appreciated. Thanks!

You could use indexOf and lastIndexOf to get the position of the quotes:
var openQuote = myString.indexOf('"'),
closeQuote = myString.lastIndexOf('"');
Then you can validate they are not the same position, and use substring to retrieve the code:
var code = myString.substring(openQuote, closeQuote + 1);

Regex:
var a = "I'm sorry the code \"codehere\" is not valid";
var m = a.match(/"[^"]*"/ig);
alert(m[0]);

Try this:
var str = "I'm sorry the code \"cod\"eh\"ere\" is not valid";
alert(str.replace(/^[^"]*"(.*)".*$/g, "$1"));

You could use Javascript's match function. It takes as parameter, a regular expression. Eg:
/\".*\"/

Use regular expressions! You can find a match using a simple regular expressions like /"(.+)"/ with the Javascript RegExp() object. Fore more info see w3schools.com.

Try this:
var msg = "I'm sorry the code \"codehere\" is not valid";
var matchedContent = msg.match(/\".*\"/ig);
//matchedContent is an array
alert(matchedContent[0]);

You should use a Regular Expression. This is a text pattern matcher that is built into the javascript language. Regular expressions look like this: /thing to match/flags* for example, /"(.*)"/, which matches everything between a set of quotes.
Beware, regular expressions are limited -- they can't match nested things, so if the value inside quotes contains quotes itself, you'll end up with a big ugly mess.
*: or new RegExp(...), but use the literal syntax; it's better.

You could always use the .split() string function:
var mystring = 'I\'m sorry the code "codehere" is not valid' ;
var tokens = [] ;
var strsplit = mystring.split('\"') ;
for(var i=0;i<strsplit.length;i++) {
if((i % 2)==0) continue; // Ignore strings outside the quotes
tokens.push(strsplit[i]) ; // Store strings inside quotes.
}
// Output:
// tokens[0] = 'codehere' ;

Splitting string in javascript

How can I split the following string?
var str = "test":"abc","test1":"hello,hi","test2":"hello,hi,there";
If I use str.split(",") then I won't be able to get strings which contain commas.
Whats the best way to split the above string?

I assume it's actually:
var str = '"test":"abc","test1":"hello,hi","test2":"hello,hi,there"';
because otherwise it wouldn't even be valid JavaScript.
If I had a string like this I would parse it as an incomplete JSON which it seems to be:
var obj = JSON.parse('{'+str+'}');
and then use is as a plain object:
alert(obj.test1); // says: hello,hi
See DEMO
Update 1: Looking at other answers I wonder whether it's only me who sees it as invalid JavaScript?
Update 2: Also, is it only me who sees it as a JSON without curly braces?

Though not clear with your input. Here is what I can suggest.
str.split('","');
and then append the double quotes to each string

str.split('","'); Difficult to say given the formatting
if Zed is right though you can do this (assuming the opening and closing {)
str = eval(str);
var test = str.test; // Returns abc
var test1 = str.test1; // returns hello,hi
//etc

That's a general problem in all languages: if the items you need contain the delimiter, it gets complicated.
The simplest way would be to make sure the delimiter is unique. If you can't do that, you will probably have to iterate over the quoted Strings manually, something like this:
var arr = [];
var result = text.match(/"([^"]*"/g);
for (i in result) {
arr.push(i);
}

Iterate once over the string and replace commas(,) following a (") and followed by a (") with a (%) or something not likely to find in your little strings. Then split by (%) or whatever you chose.