1.email地址有效性检测
<script language='JScript'>
function validateEmail(emailStr)
{
var re=/^[\w.-]+@([0-9a-z][\w-]+\.)+[a-z]{2,3}$/i;
//或 var re=new RegExp("^[\\w.-]+@([0-9a-z][\\w-]+\\.)+[a-z]{2,3}$","i");
if(re.test(emailStr))
{
alert("有效email地址!");
return true;
}
else
{
alert("无效email地址!");
return false;
}
}
</script>
2.字符串替换操作
<script language='JScript'>
var r, pattern, re;
var s = "The rain in Spain falls mainly in the plain falls.";
pattern = /falls/ig;
re = s.replace(re,'falling');
alert('s = ' + s + '\n' + 're = ' + re);
</script>
3.模式查找字符串
<script language='JScript'>
var index, pattern;
var str = "four for fall fell fallen fallsing fall falls waterfalls ";
pattern = /\bfalls\b/i;
index = str.search(pattern);
alert('The position of match is at ' + index);
</script>
3.正则表达式属性例程
<script language='JScript'>
function matchAttrib()
{
var s='';
var re = new RegExp("d(b+)(d)","ig");
var str = "cdbBbdbsbdbdz";
while((arr = re.exec(str))!=null)
{
s += "=======================================<br>";
s += "$1 returns: " + RegExp.$1 + "<br>";
s += "$2 returns: " + RegExp.$2 + "<br>";
s += "$3 returns: " + RegExp.$3 + "<br>";
s += "input returns : " + RegExp.input + "<br>";
s += "index returns : " + RegExp.index + "<br>";
s += "lastIndex returns : " + RegExp.lastIndex + "<br>";
s += "lastMatch returns: " + RegExp.lastMatch + "<br>";
s += "leftContext returns: " + RegExp.leftContext + "<br>";
s += "rightContext returns: " + RegExp.rightContext + "<br>";
s += "lastParen returns: " + RegExp.lastParen + "<br>";
s += "arr.index returns: " + arr.index + "<br>";
s += "arr.lastIndex returns: " + arr.lastIndex + "<br>";
s += "arr.input returns: " + arr.input + "<br>";
s += "re.lastIndex returns: " + re.lastIndex + "<br>";
s += "re.source returns: " + re.source + "<br>";
}
return(s); //Return results.
}
document.write(matchAttrib());
</script>
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