function test(bin, bytes){ var r, i; hex = '', chars = '\n: -'; //generate an array of random octets and //a corresponding hex string for(i = 0; i < bytes; i++){ r = Math.random() * 0x100 | 0, bin[i] = (r & 0xff); hex += (r >> 4).toString(16) + (r & 0xf).toString(16); } //insert non-hex characters at random positions in hex string for(i = 0; i < 10; i++){ r = Math.random() * hex.length | 0; hex = hex.slice(0, r) + chars.charAt(r & 3) + hex.slice(r); } return hex; } var expected = [], testCase = test(expected, 10000); function parseHex1(hex){// original hex = hex.replace(/[^0-9a-fA-F]/g, ''); var i, len = hex.length, bin = []; for(i = 0; i < len - 1; i += 2){ bin.push(+('0x' + hex.substring(i, i + 2))); } return bin; } function parseHex2(string) {// replace match map ES5 return string.replace(/[^0-9a-fA-F]/g, '').match(/[0-9a-fA-F]{2}/g).map(function(hex) { return parseInt(hex, 16); }); } function parseHex3(hex){//match without replace hex = hex.match(/[\da-f]/gi); for(var i = 0; i < hex.length - 1; i += 2){ hex[i >> 1] = +('0x' + hex[i] + hex[i + 1]); } hex.length = i >> 1; return hex; } function parseHex4(hex){// iteration with replace var bin = []; hex.replace(/([\da-f])[^\da-f]*([\da-f])/gi, function(m, digit1, digit2){ bin.push(+('0x' + digit1 + digit2)); } ); return bin; } function parseHex5(hex){// looping with exec var bin = [], regex = /([\da-f])[^\da-f]*([\da-f])/gi, result; while(result = regex.exec(hex)){ bin.push(+('0x' + result[1] + result[2])); } return bin; } function parseHex6(hex){// non regex var bin = [], i, c, isEmpty = 1, buffer; for(i = 0; i < hex.length; i++){ c = hex.charCodeAt(i); if(c > 47 && c < 58 || c > 64 && c < 71 || c > 96 && c < 103){ buffer = buffer << 4 ^ (c > 64 ? c + 9 : c) & 15; if(isEmpty ^= 1){ bin.push(buffer & 0xff); } } } return bin; }