正则表达式练习器

March 25,2004

正则表达式的用途很广泛，但要熟练掌握就不是一件容易的事情了。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>
<meta name = 安徽池州统计局徐祖宁 e-mail:[email protected]>
<script language="JavaScript">
function OnMove() {
window.status = "("+window.event.clientX+","+window.event.clientY+")" + " :: "+document.location
}
</script>

<SCRIPT LANGUAGE="JavaScript1.2">
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>
<BODY style="font-size=9pt;" OnMouseMove=OnMove()>
<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:[email protected]>[email protected]</a></td></tr></table>
<table width=100% broder=1 frame=above rules=none style="font-size:9pt;">
<tr><td width=50%  valign=top>
输入一些被寻找的正文:<BR>
<TEXTAREA NAME="main" COLS=58 ROWS=5 WRAP="virtual" style="font-size:9pt;">
09-11-2001 09/11/2001 [email protected]
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>
<TEXTAREA NAME="regexp" COLS=51 ROWS=5 style="font-size:9pt;"></TEXTAREA>
<INPUT TYPE="button" VALUE="清除" onClick="this.form.regexp.value=''" style="font-size:8pt;height:18px"><BR>
<INPUT TYPE="button" VALUE="能找到吗?[regexObject.test(string)]" style="font-size:8pt;width:70%;height:18px" onClick="findIt(this.form)">
<INPUT TYPE="radio" NAME="output" style="font-size:8pt;height:18px">Yes
<INPUT TYPE="radio" NAME="output" style="font-size:8pt;height:18px">No <BR>
<INPUT TYPE="button" VALUE="在哪里?[string.search(regexObject)]" style="font-size:8pt;width:70%;height:18px" onClick="locateIt(this.form)">
<INPUT TYPE="text" NAME="offset" SIZE=4 style="font-size:8pt;height:18px">
</td>
<td valign=top>
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">
　　　　允许复制<INPUT TYPE="checkbox" NAME="selechkmode" style="font-size:8pt;height:18px">
<textarea NAME="regexplist" cols=58 rows=14 wrap=off style="font-size:9pt;">
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>
<tr><td valign=bottom>
<INPUT TYPE="button" VALUE="有哪些?[regexObject.exec(string)]" style="font-size:8pt;width:70%;height:18px" onClick="execIt(this.form)">
　　单步<INPUT TYPE="checkbox" NAME="scankmode" style="font-size:8pt;height:18px"><BR>
<TEXTAREA NAME="reglist" COLS=58 ROWS=8 style="font-size:9pt;"></TEXTAREA>
</td>
<td valign=bottom>
匹配到的成分:(单步时可见)
<TEXTAREA NAME="matchlist" COLS=58 ROWS=8 style="font-size:9pt;"></TEXTAREA>
</td></tr></table></FORM>
<script>
setregexp(1)
</script>
</BODY>
</HTML>

对正则表达式练习器的改进，原贴ID901680

覆盖原execIt函数
修改后的execIt函数允许对多个正则表达式进行匹配(每个正则表达式一行)，并对每一个匹配成分显示出是第几个正则表达式匹配的。
这可视为语法分析的雏形，只要对匹配产生相应的动作。

function execIt(form) {
  var mode
  if(form.chkmode.checked) mode = "gi"
  else mode = "g"
  var regexpArray = form.regexp.value.split("rn")  //获取正则表达式到数组

  if(nextpoint == 0) form.reglist.value = ""
  var key = true
  if(form.scankmode.checked) key = false
  else nextpoint = 0
  do {
var offs = 9999999999
var pos = -1
var input = form.main.value.substr(nextpoint)
//对每个正则表达式进行匹配
for(var i=0;i<regexpArray.length;i++) {
   re.compile(regexpArray,mode)
   var matchArray = re.exec(input)
   if(matchArray) {
      if(offs > matchArray.index) {
      offs = matchArray.index
      pos = i  //保存距离起始位子最近的匹配
      }
   }
}
if(pos>=0) {
   re.compile(regexpArray[pos],mode)
   var matchArray = re.exec(input)
   for(var i=1;i<matchArray.length;i++)
      matchArray = "$"+i+":"+matchArray
   form.reglist.value = "["+(pos+1)+"]"+(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)
}