JavaScript正则表达式用法

时间：2014-12-15 18:39:20 阅读：175 评论：0 收藏：0 [点我收藏+]

JavaScript正则表达式用法

演示：http://www.huiyi8.com/jiaoben/

<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>

原文地址：http://www.cnblogs.com/lhrs/p/4165315.html

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