String/RegExp search methods

strings.js

<div id="placeholder">
Output goes here
</div>

const string = 'there is a cow in a field';

function print(result) {
	console.log(result);
	document.getElementById('placeholder')
  	.innerText = result;
}

//String.indexOf();
//returns index of first matched char, or -1
function stringIndex(subStr) {
	var found = string.indexOf(subStr);
	print(found);
}
//stringIndex('stuff');

//String.search();
//same behavior as indexOf();
function searchString(subStr) {
	var found = string.search(subStr);
  print(found);
}
//searchString(' is a ');

//RegExp.test();
//searches using regex, returns boolean
//similar to string.search(), except return is bool
function testString(re) {
	console.log(re.source);
	var found = re.test(string);
  print(found);
}
//testString(/there/);

//RegExp.exec();
//returns an array of info (search term, index, input) or null
function execString(re) {
	console.log(re.source);
  var found = re.exec(string);
  print(found);
}
//execString(/cow/);

//String.match();
//returns an array of info (search term, index, input) or null
//similar to RegExp.exec();
function matchString(re) {
	console.log(re.source);
  var found = string.match(re);
  print(found);
}
//matchString(/there is a/);

//String.replace();
//Searches for substr, and replaces if found
//can search by RegExp, and replace using fn
//returns a new string, orig string unchanged
function replaceString(subStr, newStr) {
	print(string.replace(subStr, newStr));
}
//replaceString('is a cow', 'are cows');

//String.replace();
//Uses RegExp or string to split string into
//array of substrings
function splitString(separator) {
	var stringArr = string.split(separator);
  print(stringArr);
}
//splitString(' ');

function reverseString(separator, newSeparator) {
	var stringArr = string.split(separator)
  		.reverse()
                .join(newSeparator);
  print(stringArr);
}

reverseString(' ', ' / ');