JSFiddle - React, Tailwind, and code Playground

JavaScript

var x = "M 178.6491699876038 23.419570090792845 C 183.6491699876038 23.419570090792845 186.47776067057902 30.902823043098138 190.3670728596699 41.19229585251793 L 194.25638504876076 51.48176866193772" ; 
var c = x.indexOf('C') ; 
var L = x.indexOf('L') ;

var final = x.slice (c,L) ;
alert(x.replace(final, '')) ;