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I need help getting the first n characters of a string up to when a number character starts

I'm working with a string where I need to extract the first n characters up to where numbers begin. What would be the best way to do this as sometimes the string starts with a number: 7EUSA8889er898 I would need to extract 7EUSA But other string examples would be SWFX74849948, I would need to extract SWFX from that string.
Not sure how to do this with regex my limited knowledge is blocking me at this point:
^(\w{4}) that just gets me the first four characters but I don't really have a stopping point as sometimes the string could be somelongstring292894830982 which would require me to get somelongstring

Using \w will match a word character which includes characters and digits and an underscore.
You could match an optional digit [0-9]? from the start of the string ^and then match 1+ times A-Za-z
^[0-9]?[A-Za-z]+
Regex demo
const regex = /^[0-9]?[A-Za-z]+/;
[
"7EUSA8889er898",
"somelongstring292894830982",
"SWFX74849948"
].forEach(s => console.log(s.match(regex)[0]));

Can use this regex code:
(^\d+?[a-zA-Z]+)|(^\d+|[a-zA-Z]+)
I try with exmaple and good worked:
1- somelongstring292894830982 -> somelongstring
2- 7sdfsdf5456 -> 7sdfsdf
3- 875werwer54556 -> 875werwer

If you want to create function where the RegExp is parametrized by n parameter, this would be
function getStr(str,n) {
var pattern = "\\d?\\w{0,"+n+"}";
var reg = new RegExp(pattern);
var result = reg.exec(str);
if(result[0]) return result[0].substr(0,n);
}

There are answers to this but here is another way to do it.
var string1 = '7EUSA8889er898';
var string2 = 'SWFX74849948';
var Extract = function (args) {
var C = args.split(''); // Split string in array
var NI = []; // Store indexes of all numbers
// Loop through list -> if char is a number add its index
C.map(function (I) { return /^\d+$/.test(I) === true ? NI.push(C.indexOf(I)) : ''; });
// Get the items between the first and second occurence of a number
return C.slice(NI[0] === 0 ? NI[0] + 1 : 0, NI[1]).join('');
};
console.log(Extract(string1));
console.log(Extract(string2));
Output
EUSA
SWFX7

Since it's hard to tell what you are trying to match, I'd go with a general regex
^\d?\D+(?=\d)

Grab strings before and after inner string in regex Javascript

I have a string like this:
20 EQUALS 'Value goes here'
I want to split it up into 3 separate strings:
conditionField = 20
conditionOperation = 'EQUALS'
conditionValue = 'Value goes here'
I tried this to get the Condition Field:
var conditionField = condition.replace(/(.*)(.*EQUALS)/, '$1');
But it get's the beginning and the end.
I'm having trouble splitting it up and dealing with the white space and spaces in the value.

Your question would actually be a bit of challenge if you wanted to arbitrarily extract quoted terms along with individual words. But since you appear to have a rather fixed structure, starting with a single number, then a single word command, followed by a third term, we can use the following regex pattern here:
([^\\s]*)\\s+([^\\s]*)\\s+(.*)
Each term in parentheses above will be made available as a capture group after the match has been run. In this case, I just blanket everything after the first two terms together.
var string = "20 EQUALS 'Value goes here'";
var re = new RegExp("([^\\s]*)\\s+([^\\s]*)\\s+(.*)");
match = re.exec(string);
if (match != null) {
console.log(match[1])
console.log(match[2])
console.log(match[3])
}

Try this :
var data = '20 EQUALS 30';
var a = data.split(/(\d*) ([a-zA-Z]*) (\d*)/g);
conditionField = a[1];
conditionOperation = a[2];
conditionValue = a[3];

Adding Dashes to a number without many lines of code

I have a number returned from the database
e.g.
329193914
What I would like to do it simply be able to just insert dashes every 3 characters.
e.g.
329-193-914
I was looking at regex, replace and slice , slice I had a hard time with as a lot of example are like f.value and i'm not passing in "this" (entire element)

if your number can be treated as a string:
var str = '329193914';
var arr = str.match(/.{3}/g); // => ['329', '193', '914']
var str2 = arr.join('-'); // => '329-193-914'

Converting number to string to number to delete dot

I need to remove the dot in 1.400 in order to get the integer 1400, but it return 140. How do I obtain 1400 as an integer?
var var2= String(1.400) ;
var2 = var2.replace(".","");
var2=parseInt(var2);

There's no way the code you've given returns 140, since 1.400 is a number literal and gets shortened to 1.4 straight away and only then turned to string of "1.4". Therefore replacing a dot and converting to int results in 14.
It's not possible to tell JavaScript that number of 1.400 is not 1.4. You'd have to start with a string of "1.400" to get what you want.
Instead of going number -> string -> number maybe you could multiply the number by a thousand, or whatever order of magnitude is required.

Here is the problem ,
var var2= String(1.400) ;
alert(var2); //Returns 1.4 cause it is performing Number to String conversion
So , Change it to var var2= "1.400"; or var var2=number.toString();
And Update the replace to
var2.replace(/\./g,""); // : /g means all occurrence
You need to escape the . because it has the meaning of an arbitrary character in a regex.

Using this you will get your expected output.
var var2= "1.400" ;
var2 = var2.replace(".","");
var2=parseInt(var2);
Explanation:
var s1 = '2 + 2'; // creates a string primitive
var s2 = new String('2 + 2'); // creates a String object
console.log(eval(s1)); // returns the number 4
console.log(eval(s2)); // returns the string "2 + 2"

Add single-quotes around the initial string:
var var2= String('1.400');

Javascript / Jquery - Get number from string

the string looks like this
"blabla blabla-5 amount-10 blabla direction-left"
How can I get the number just after "amount-", and the text just after "direction-" ?

This will get all the numbers separated by coma:
var str = "10 is smaller than 11 but greater then 9";
var pattern = /[0-9]+/g;
var matches = str.match(pattern);
After execution, the string matches will have values "10,11,9"
If You are just looking for thew first occurrence, the pattern will be /[0-9]+/ - which will return 10
(There is no need for JQuery)

This uses regular expressions and the exec method:
var s = "blabla blabla-5 amount-10 blabla direction-left";
var amount = parseInt(/amount-(\d+)/.exec(s)[1], 10);
var direction = /direction-([^\s]+)/.exec(s)[1];
The code will cause an error if the amount or direction is missing; if this is possible, check if the result of exec is non-null before indexing into the array that should be returned.

You can use regexp as explained by w3schools. Hint:
str = "blabla blabla-5 amount-10 blabla direction-left"
alert(str.match(/amount-([0-9]+)/));
Otherwize you can simply want all numbers so use the pattern [0-9]+ only.
str.match would return an array.