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JavaScript正则表达式用法

2024-08-08 02:22:53   218人阅读

JavaScript正则表达式用法

 

演示：http://www.huiyi8.com/jiaoben/

javascript特效

 

<!-- 更多信息可以参考 http://hi.baidu.com/jxqlovejava/item/4160b33ab4414d82f4e4ad4b -->
<script type="text/javascript">
     
    var matchedTimes = 0;
     
    //Match one d followed by one or more b‘s followed by one d
    //Remember matched b‘s and the following d
    //Ignore case
    myRe    = new RegExp("d(b+)(d)", "ig"); // 等价于 myReg = /d(b+)(d)/ig;
    myArray = myRe.exec("ecDBDsdbbdz"); // ecdbBdbsdbbdz
     
    console.log("Regular Expression String: " + myRe.source);
    console.log("Is global? " + myRe.global);
    console.log("Ignore case? " + myRe.ignoreCase);
    console.log("Is mulitiline? " + myRe.multiline);
    console.log("------------------------------------------------");
     
    logInfo(myArray, myRe);
     
    myArray = myRe.exec("ecDBDsdbbdz");
     
    logInfo(myArray, myRe);
     
    function logInfo(myArray, myRe) {
       matchedTimes++;
     
       console.log("This is " + matchedTimes + " times match");
       console.log("Original String: " + myArray.input);
       console.log("Match Result Array: [" + myArray + "]");
       console.log("The 0-based index of the match in the string: " + myArray.index);
       console.log("The last matched characters: " + myArray[0]);
       console.log("The parenthesized substring matches [1]: " + myArray[1]);
       console.log("The parenthesized substring matches [2]: " + myArray[2]);
       console.log("The index at which to start the next match: " + myRe.lastIndex);
       console.log("-----------------------------------------------");
    }
 
    myRe2 = /^\w+(\d*)$/ig
    console.log("myRe2: " + myRe2.source);
    //console.log("myRe2 matches abc1? " + myRe2.test("abc1")); // 加上这行跑跑看结果，因为是global匹配，所以lastIndex会改变，所以后面的myRe2.test("abc")当然就是false
    console.log("myRe2 matches abc? " + myRe2.test("abc"));
 
</script>

JavaScript正则表达式用法


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