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:czjsz@stats.gov.cn><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] = "$"+i+":"+matchArray[i] 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("\r\n") 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:czjsz_ah@stats.gov.cn>czjsz_ah@stats.gov.cn</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 czjsz_ah@stats.gov.cnasdff 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])[-./](\d\d\d\d))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>
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