exec方法為正則表達式匹配的文本搜索字符串。如果找到匹配，則返回結果數(shù)組; 否則，返回null。
語法
RegExpObject.exec( string );
下面是參數(shù)的詳細信息：
返回值:
例子：
<html><head><title>JavaScript RegExp exec Method</title></head><body><script type="text/javascript"> var str = "Javascript is an interesting scripting language"; var re = new RegExp( "script", "g" ); var result = re.exec(str); document.write("Test 1 - returned value : " + result); re = new RegExp( "pushing", "g" ); var result = re.exec(str); document.write("<br />Test 2 - returned value : " + result); </script></body></html>這將產(chǎn)生以下結果：
Test 1 - returned value : scriptTest 2 - returned value : null
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