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RegExp.prototype.toString()

JavaScript RegExp.prototype.toString()方法

toString()方法返回表示正则表达式的字符串。

语法

RegExpObj.toString();

参数

NA

返回值

此方法返回表示给定对象的字符串。

示例1

var str = "";
var re = new RegExp( "","g" );
var result = re.toString(str);
document.write("<br />Returned value : " + result);
输出:
Returned value:/(?:)/g

示例2

document.write (new RegExp("a+b+c","g").toString());
document.write(new RegExp("<br\>gt+yu").toString());
document.write(new RegExp("<br\>abcd").toString());
document.write(new RegExp('<br\>\\n', 'g').toString());
输出:
/a + b + c/g/
gt + yu//
A B C D//
\ n/g

示例3

var str = "scripting language";
 var re = new RegExp( "script", "g" );
   var result = re.toString(str);
 document.write("Returned value : " + result);
 re = new RegExp( "","g" );
  var result = re.toString(str);
 document.write("<br />Returned value : " + result);
输出:
Returned value:/script/g
Returned value:/(?:)/g
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