js-indicesof

Just like indexOf(), but returns an array of all occurrences.

Will return an empty array if there is no match.

Install

npm i indicesof

Syntax

function (needle, haystack, startOffset, endOffset ]);

• haystack can be a string or a buffer.
• startOffset is optional. Default is 0.
• endOffset is optional. Default is the haystack length. Note that the entire length of the needle must be within the offsets to be a match. Also, the offset is not inclusive.

Strings vs Buffers

Note that the byte position is returned for Buffers, which might not be the same as the char position for strings:

indicesOf('l', 'Älg'); // Returns [ 1 ]
indicesOf('l', Buffer.from('Älg', 'utf8')); // Returns [ 2 ]

Example

var indicesOf = require('indicesof');
var haystack = "If I Can't Dance It's Not My Revolution";
indicesOf('n', haystack); // [ 7, 13, 38 ]
indicesOf('an', haystack); // [ 6, 12 ]
indicesOf('Dan', haystack); // [ 11 ]
indicesOf('dan', haystack); // [ ]