2005-10-21

正则表达式练习器

来源: 本站收集整理作者:佚名评论 0 条

正则表达式的用途很广泛，但要熟练把握就不是一件轻易的事情了。为此，我编写了这个练习器用来帮助学习。
请多指教！

*********将以下代码复制到 RegExp.htm 即可*********

<HTML>

<HEAD>

<TITLE>正则表达式练习器</TITLE>

function OnMove() {

window.status = "(" window.event.clientX "," window.event.clientY ")"   " :: " document.location

}

</script>

var re = new RegExp()  //建立正则表达式对象

var nextpoint = 0      //匹配时的偏移量

//设置正则表达式

function setPattern(form) {

var mode

if(form.chkmode.checked) mode = "gi"  //i:不分大小写 g:全局，好象没什么作用

else mode = "g"

re.compile(form.regexp.value,mode)

nextpoint = 0

form.reglist.value = ""

}

//检查是否有匹配

function findIt(form) {

setPattern(form)

var input = form.main.value

if (input.search(re) != -1) {

form.output[0].checked = true

} else {

form.output[1].checked = true

}

//检查匹配位置

function locateIt(form) {

setPattern(form)

var input = form.main.value

form.offset.value = input.search(re)

}

//检查所有的匹配情况

function execIt(form) {

if(nextpoint == 0 || ! form.scankmode.checked) {

findIt(form)

form.reglist.value = ""

}

var key = true

if(form.scankmode.checked) key = false

do {

var input = form.main.value

var matchArray = re.exec(input.substr(nextpoint))

if(matchArray) {

for(var i=1;i<matchArray.length;i  )

matchArray = "$" i ":" matchArray

form.reglist.value = (nextpoint matchArray.index) " => "   matchArray[0]  "n" form.reglist.value

form.matchlist.value = "$0:" matchArray.join("n")

nextpoint = nextpoint   matchArray.index   matchArray[0].length

}else {

if(!key)

form.reglist.value = "没有找到n"   form.reglist.value

form.matchlist.value = " "

nextpoint = 0

key = false

}

}while (key)

}

//设置当前使用的正则表达式

function setregexp(n) {

var s = document.all.regexplist.value.split("rn")

document.all.regexp.value = s[n*2-1]  //.replace("r","")

nextpoint = 0

}

//定义选择监视

var isNav = (navigator.appName == "Netscape")

function showSelection() {

if (isNav) {

var theText = document.getSelection()

} else {

var theText = document.selection.createRange().text

}

if(theText.length>0 && document.all.selechkmode.checked)

document.all.regexp.value = theText

}

if (isNav) {

document.captureEvents(Event.MOUSEUP)

}

document.onmouseup = showSelection

</SCRIPT>

</HEAD>

<FORM><table width=100% cellspacing=0 cellpadding=0><tr><td><font color=red>正规表达式练习器</font></td><td align=right><a href=mailto:czjsz_ah@stats.gov.cn>czjsz_ah@stats.gov.cn</a></td></tr></table>

输入一些被寻找的正文:<BR>

09-11-2001 09/11/2001 czjsz_ah@stats.gov.cn

asdff 12345 196.168.1.3 www.sohu.com ftp://www.chinaasp.com 2001.9.11 http://www.active.com.cn/club/bbs/bbsView.asp http://www.163.com/inden.htm

</TEXTAREA><BR>

进行匹配的正规表达式:　　忽略大小写<INPUT TYPE="checkbox" NAME="chkmode" checked style="font-size:8pt;height:18px"><BR>

<INPUT TYPE="radio" NAME="output" style="font-size:8pt;height:18px">Yes

</td>

测试用正则表达式列表:

使用第<input type=text name=num size=2 value=1 style="font-size:8pt;height:18px">个<input type=button value=Go onClick=setregexp(this.form.num.value) style="font-size:8pt;height:18px">

答应复制<INPUT TYPE="checkbox" NAME="selechkmode" style="font-size:8pt;height:18px">

1.检查日期:

(1[0-2]|0?[1-9])[-./](0?[1-9]|[12][0-9]|3[01])[-./](dddd))

2.检查数字:

([- ]?[0-9] .?[0-9] )

3.检查URL:

((http|ftp)://)?(((([d] .) ){3}[d] (/[w./] )?)|([a-z]w*((.w ) ){2,})([/][w.~]*)*)

4.检查E-mail

w @((w [.]?) )

</textarea>

</td></tr>

单步<INPUT TYPE="checkbox" NAME="scankmode" style="font-size:8pt;height:18px"><BR>

</td>

匹配到的成分:(单步时可见)

</td></tr></table></FORM>

setregexp(1)

</script>

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