- Tags: JS RegExp Property, RegExp
- Categories: JavaScript Reference, JavaScript RegExp, Reference
Quick Reference
The JavaScript RegExp lastIndex property specifies the index at which to start the next match, and only works if the g modifier is set.
// variables
let text = 'Hello World, Hello Universe';
let pattern = /llo/g;
let result = '';
while (pattern.test(text) == true) {
result += 'Found at position ' + pattern.lastIndex + '
'; // starts the next match directly after the previous match
}
// output to the HTML element
document.getElementById('my_output').innerHTML = result;
/regexp/g
Output
Found at position 5
Found at position 18
Syntax
RegExpObject.lastIndex
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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