e.g. if I run this javascript:
var str = 'hello_world_there';
var parts = str.split('_', 2);
var p1 = parts[0];
var p2 = parts[1];
at the end, p1 contains "hello", and p2 contains "world".
I'd like p1 to contain "hello", and p2 to contain "world_there". i.e. I want p2 to contain the rest of the string, regardless of how many underscores it has (similar to how c#'s String.Split(char[] separator, int count) behaves.
Any workarounds ?
var str = 'hello_world_there';
var parts = str.split('_');
var p1 = parts[0];
var p2 = parts.slice(1).join('_');
This will do an ordinary split, but then merge everything past the first match.
This is slightly different from taking the rest as is, but this was useful in my case:
const [a, ...b] = 'foo/bar/baz'.split('/');
// => a: 'foo', b: ['bar', 'baz']
Write your own function:
function split(string, delimiter, n) {
var parts = string.split(delimiter);
return parts.slice(0, n - 1).concat([parts.slice(n - 1).join(delimiter)]);
}
Just try with:
var parts = str.split('_', 2);
var p1 = parts.shift();
var p2 = parts.join('_');
or:
var index = str.indexOf('_');
var p1 = str.substr(0, index);
var p2 = str.substr(index + 1);
For your specific case where you just want two parts, the simplest thing is indexOf and substring:
const index = text.indexOf("_");
const p0 = index === -1 ? text : text.substring(0, index);
const p1 = index === -1 ? "" : text.substring(index + 1);
Live Example:
const text = "hello_world_there";
const index = text.indexOf("_");
const p0 = index === -1 ? text : text.substring(0, index);
const p1 = index === -1 ? "" : text.substring(index + 1);
console.log(`p0 = "${p0}", p1 = "${p1}"`);I've found I want that often enough I have it in a utility module:
const twoParts = (str, delim = " ") => {
const index = str.indexOf("_");
if (index === -1) {
return [str, ""];
}
return [
str.substring(0, index),
str.substring(index + delim.length),
];
};
But if you wanted to do more than just teh two parts, an approach that doesn't require rejoining the string after the fact would be to use a regular expression with capture groups:
const result = text.match(/^([^_]+)_+([^_]+)_+(.*)$/);
const [_, p0 = "", p1 = "", p2 = ""] = result ?? [];
Live Example:
const text = "hello_world_xyz_there";
const result = text.match(/^([^_]+)_+([^_]+)_+(.*)$/);
const [_, p0 = "", p1 = "", p2 = ""] = result ?? [];
console.log(`p0 = "${p0}", p1 = "${p1}", p2 = "${p2}"`);
Regexp solution (you can change "|" to other chars e.g. "__" but not to "_")
var [p1,p2] = str.replace(/_/,"|").split("|");
let str = 'hello_world_there'
let [p1,p2] = str.replace(/_/,"|").split("|");
console.log("p1:",p1);
console.log("p2:",p2);