JS+正規表現の使用に関するヒント

var msg="dsada[emoji:37]dsadas[emoji:3900]法拉綏芬河"; function fetch(msg) { var match, result = msg, reg = /\[emoji:\d+\]/g, emojiIndex, totalEmojiNum = 45; while (match = reg.exec(msg)) { console.log(match[0]);//[emoji:37],[emoji:3900] emojiIndex = match[0].slice(7, -1); console.log(emojiIndex);//37,3900 if (emojiIndex > totalEmojiNum) { result = result.replace(match[0], '[X]'); } else { result = result.replace(match[0], ''); }; }; return result;//"dsadadsadas[X]法拉綏芬河" } fetch(msg);