Output a smaller regular expression using regexgen

Closes #8.

package.json

@@ -39,11 +39,9 @@
 	"devDependencies": {
 		"coveralls": "^2.11.1",
 		"istanbul": "^0.3.5",
-		"jsesc": "^0.5.0",
 		"lodash.template": "^3.2.0",
 		"mocha": "^2.1.0",
-		"regenerate": "^1.2.1",
-		"regex-trie": "^1.0.4",
+		"regexgen": "^1.0.0",
 		"string.fromcodepoint": "^0.2.1",
 		"unicode-tr51": "^6.0.0"
 	}

scripts/generate-regex.js

@@ -1,32 +1,21 @@
 var fs = require('fs');
 var path = require('path');
 
-var jsesc = require('jsesc');
-var regenerate = require('regenerate');
-var regExpTrie = require('regex-trie');
+var regexgen = require('regexgen');
 var template = require('lodash.template');
 require('string.fromcodepoint');
 
 var emojiCodePoints = require('unicode-tr51/code-points');
-
-var multipleCodePointsTrie = regExpTrie();
-var loneCodePointsSet = regenerate();
-emojiCodePoints.forEach(function(value) {
+var strings = emojiCodePoints.map(function(value) {
 	if (Array.isArray(value)) {
-		var string = String.fromCodePoint.apply(null, value);
-		multipleCodePointsTrie.add(string);
-	} else {
-		loneCodePointsSet.add(value);
+		return String.fromCodePoint.apply(null, value);
 	}
+	return String.fromCodePoint(value);
 });
 
-var loneCodePointsPart = loneCodePointsSet.toString();
-var multipleCodePointsPart = multipleCodePointsTrie.toString();
-
 var ROOT = path.resolve(__dirname, '..');
 var sourceTemplate = template(fs.readFileSync(ROOT + '/templates/index.js'));
 var result = sourceTemplate({
-	'multipleCodePointsPart': multipleCodePointsPart,
-	'loneCodePointsPart': loneCodePointsPart
+	'regex': regexgen(strings, 'g')
 });
 fs.writeFileSync(ROOT + '/index.js', result);

templates/index.js

@@ -1,3 +1,3 @@
 module.exports = function() {
-	return /<%= multipleCodePointsPart %>|<%= loneCodePointsPart %>/g;
+	return <%= regex %>;
 };