[Rel] JavaScript正则表达式生成器

看到某写的东西，找不到留言的地方，遂自己写一个。

//原始实现 function convertToJsEsc(chars) { var result = ''; for(var i=0; i<chars.length; i++) { var code = chars.charCodeAt(i); switch (code) { case 0x20: result += "\\s"; break; case 0x22: result += "\\\""; break; case 0x27: result += "\\\'"; break; case 0x28: result += "\\("; break; case 0x29: result += "\\)"; break; case 0x2A: result += "\\*"; break; case 0x2B: result += "\\+"; break; case 0x2E: result += "\\."; break; case 0x2F: result += "\\/"; break; case 0x3F: result += "\\?"; break; case 0x5B: result += "\\["; break; case 0x5C: result += "\\\\"; break; case 0x5D: result += "\\]"; break; case 0x7B: result += "\\{"; break; case 0x7D: result += "\\}"; break; default: if(code > 0x1F && code < 0x7F) { result += chars[i]; } else { result += "\\u" + code.toString(16).toUpperCase(); } break; } } return result === "" ? "Nothing to convert" : result; } //我的修改 function convertToJsEsc(chars) { return chars && chars.replace( /([ "'\(\)\*\+\.\/\?\[\\\]\{\}])|([\x1F-\x7F])|(.)/g, function(all, a, b, c){ return a ? ('\\' + (all==' '?'s':all)) : b ? all : ('\\u' + all.charCodeAt().toString(16).toUpperCase()); } ) || 'Nothing to convert'; }

有啥区别？
优点：方便修改
缺点：难于理解。