Code

var text1 = abcdefgh;

var text2 = cde;



alert(text1.substring(0, text1.indexOf(text2)));

alert(text1.substring(0, text1.indexOf(text2) + text2.length));

First alert doesn't include search text, second one does.

Explanation

I'll explain the second line of the code.

text1.substring(0, text1.indexOf(text2) + text2.length))

text1.substring(startIndex, endIndex)

This piece of code takes every character from startIndex to endIndex, 0 being the first character. So In our code, we search from 0 (the start) and end on:

text1.indexOf(text2)

This returns the character position of the first instance of text2, in text 1.

text2.length

This returns the length of text 2, so if we want to include this in our returned value, we add this to the length of the returned index, giving us the returned result!