camelcase to normal text javascript

1var text = 'helloThereMister';
2var result = text.replace( /([A-Z])/g, " $1" );
3var finalResult = result.charAt(0).toUpperCase() + result.slice(1);
4console.log(finalResult);

1"thisStringIsGood"
2    // insert a space before all caps
3    .replace(/([A-Z])/g, ' $1')
4    // uppercase the first character
5    .replace(/^./, function(str){ return str.toUpperCase(); })
6

1String.prototype.toCamelCase = function () {
2	let STR = this.toLowerCase()
3		.trim()
4		.split(/[ -_]/g)
5		.map(word => word.replace(word[0], word[0].toString().toUpperCase()))
6		.join('');
7	return STR.replace(STR[0], STR[0].toLowerCase());
8};