匹配中文字符的正则表达式: [u4e00-u9fa5]
匹配双字节字符(包括汉字在内): [^x00-xff]
应用:计算字符串的长度(一个双字节字符长度计2,ASCII字符计1)
String.prototype.len=function(){return this.replace([^x00-xff]/g,"aa").length;}
匹配空行的正则表达式: n[s| ]*r
匹配HTML标记的正则表达式: /.*>|/
匹配首尾空格的正则表达式: (^s*)|(s*$)
应用:javascript中没有像vbscript那样的trim函数,我们就可以利用这个表达式来实现,如下:
String.prototype.trim = function() {
return this.replace(/(^s*)|(s*$)/g, "");
}
利用正则表达式分解和转换IP地址:
下面是利用正则表达式匹配IP地址,并将IP地址转换成对应数值的javascript程序:
function IP2V(ip) {
re=/(d ).(d ).(d ).(d )/g //匹配IP地址的正则表达式
if(re.test(ip)) {
return RegExp.*Math.pow(255,3)) RegExp.*Math.pow(255,2)) RegExp.*255 RegExp.*1
}
else {
throw new Error("Not a valid IP address!")
}
}
不过上面的程序假如不用正则表达式,而直接用split函数来分解可能更简单,程序如下:
var ip="10.100.20.168"
ip=ip.split(".")
alert("IP值是:" (ip[0]*255*255*255 ip[1]*255*255 ip[2]*255 ip[3]*1))
匹配Email地址的正则表达式: w ([- .]w )*@w ([-.]w )*.w ([-.]w )*
匹配网址URL的正则表达式: http://([w-] .) [w-] (/[w- ./?%&=]*)?
利用正则表达式去除字串中重复的字符的算法程序:
var s="abacabefgeeii"
var s1=s.replace(/(.).*/g,"")
var re=new RegExp("[" s1 "]","g")
var s2=s.replace(re,"")
alert(s1 s2) //结果为:abcefgi
用正则表达式从URL地址中提取文件名的javascript程序,如下结果为page1
s="http://www.etoow.com/page1.htm"
s=s.replace(/(.*/)([^.] ).*/ig,"")
alert(s)
利用正则表达式限制网页表单里的文本框输入内容:
用正则表达式限制只能输入中文:
onkeyup="value=value.replace(/[^u4E00-u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^u4E00-u9FA5]/g,''))"
用正则表达式限制只能输入全角字符:
onkeyup="value=value.replace(/[^uFF00-uFFFF]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^uFF00-uFFFF]/g,''))"
用正则表达式限制只能输入数字:
onkeyup="value=value.replace(/[^d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^d]/g,''))"
用正则表达式限制只能输入数字和英文:
onkeyup="value=value.replace(/[W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^d]/g,'')

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