JSFiddle - React, Tailwind, and code Playground

JavaScript

var example = "X Y\nX1 Y1\nX2 Y2";
var coordinates = example.split( "\n" );
var results = [];

for( var i = 0; i < coordinates.length; ++i ) {
    var check = coordinates[ i ].match( /(X.*) (Y.*)/ ); 
    
    if( !check ) {
        throw new Error( "Invalid coordinates: " + coordinates[ i ] );
    }

    results.push( check[ 1 ] );
    results.push( check[ 2 ] );    
}

console.log( results );