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<title>Javascript 正则表达式基础</title>
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1.使用RegExp对象：<br />
①test()方法：用于判定是否匹配。<br />
②exec()方法：返回一个数组，数组中的第一个条目是第一个匹配，其他则是反向引用。<br />
③string.match()方法：返回字符串中所有匹配条目组成的数组。<br />
2.扩展字符串方法：<br />
①replace()方法：示例正则替换。<br />
②split()方法：示例正则分割。<br />
<script type="text/javascript">
var toMatch = "a bat,a cat,a Cat,a fAt baT,a faT cat";
var regx = /cat/;
alert("1.test()：" + regx.test(toMatch));
alert("2.exec():" + regx.exec(toMatch).length);
var matchRegx = /at/gi;
var matches = toMatch.match(matchRegx);
alert("3.string.match():" + matches.length);
var toReplace = "the sky is red";
alert("4.普通replace()：" + toReplace.replace("red", "blue"));
var replaceRegx = /red/; //注意：如果需要替换所有"red",需指明正则表达式为：/red/g
alert("5.正则replace()1：" + toReplace.replace(replaceRegx, "blue"));
var replaceResult = toReplace.replace(replaceRegx, function (matched) { return "blue" });
alert("5.正则replace()2：" + replaceResult);
var colorStr = "red,blue,yellow,green";
var splitReg = /\,/; //注意元字符需转义
var colorArr = colorStr.split(splitReg);
alert("6.正则split()：" + colorArr.length);
</script>
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