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揭开正则表达式的神秘面纱（1）

正则表达式.netBlogWeb 
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揭开正则表达式的神秘面纱（1）
http://blog.csdn.net/xiaoping8411/category/427154.aspx
http://blog.csdn.net/xiaoping8411/archive/2008/07/12/2643895.aspx
http://blog.csdn.net/xiaoping8411/archive/2008/07/12/2643956.aspx


正则表达式 -- 测试工具 -- WEB版 

<HTML>
<HEAD>
<TITLE>Regular Expression Test Page</TITLE>

<!--- Some styles to make the page look nice --->
<STYLE>
  BODY {font-family:arial;font-size:12px}
  INPUT {font-size:11px}
  TEXTAREA {font-size:11px}
  TH {background:#8888FF;color:white;text-align:left}
  TD {background:#CCCC99;color:black;font-size:12px}
  TD.RowA {background:#CCCC99}
  TD.RowB {background:#EEEEBB}
  .header {font-weight:bold}
</STYLE>

<SCRIPT LANGUAGE="JavaScript">
// Turn off fields used only by replace
function hideReplaceFields() {
  document.getElementById('RegExReplace').disabled=true;
  document.getElementById('replaceheader').disabled=true;
}

// Turn on fields used only by replace
function showReplaceFields() {
  document.getElementById('RegExReplace').disabled=false;
  document.getElementById('replaceheader').disabled=false;
}

// Perform a find
function processRegexFind(text, regex, flags) {
 var reg = new RegExp(regex, flags);
 var lastIdx = -1;
 var iCount = 0;
 var result = "";
 var output = '<DIV STYLE="height:200px;overflow-y:auto;width:550">' +
     '<TABLE BORDER="0" CELLPADDING="2" CELLSPACING="0" WIDTH="550">' +
     '<TR><TH WIDTH="*">Match</TH><TH WIDTH="50">Position</TH><TH WIDTH="50">Length</TH></TR>';

 // Loop as long as have matches
 while (lastIdx != 0)
 {
  // Do it
  var mtch = reg.exec(text);
  
  // Check if got one
  if (reg.lastIndex != 0)
  {
   // Yep, increment counter
   iCount++;

   if (iCount % 2)
    style = "RowA";
   else
    style = "RowB";
   // Write output
   output += '<TR CLASS="' + style + '"><TD>' +
      RegExp.lastMatch + "</TD><TD>" +
      (reg.lastIndex-RegExp.lastMatch.length) + "</TD><TD>" +
      RegExp.lastMatch.length + "</TD></TR>";
  }
  
  lastIdx = reg.lastIndex;
 }
 
 output += "</TABLE>";

 // Build result
 if (iCount != 0)
  result = "Matches Found: " + iCount+ "<BR>" + output;
 else
  result = "No matches";  
  
 return result;
}

// Process a replace
function processRegexReplace(text, regexfind, regexreplace, flags) {
 // Define regex
 var re = new RegExp (regexfind, flags) ;
 // Do it
 var newstr = text.replace(re, regexreplace) ;
 // Generate output
 var result = '<DIV STYLE="height:200px;overflow-y:auto;width:550">' +
     '<TABLE BORDER="0" CELLPADDING="2" CELLSPACING="0" WIDTH="550">' +
     '<TR><TH>New Text</TH></TR><TR><TD>' +
     newstr + '</TD></TR>';

return result;
}

// Process entry point
function processRegex(form) {
 var output="";
 var flags;
 if (form.CaseSensitive.checked)
  flags = "g";
 else
  flags = "gi";

 // What to do?
 if (form.OperationFind.checked) {
  output=processRegexFind(form.SearchText.value, form.RegEx.value, flags);
 }
 else if (form.OperationReplace.checked) {
  output=processRegexReplace(form.SearchText.value, form.RegEx.value, form.RegExReplace.value, flags);
 }

 document.getElementById('output').innerHTML=output;
  
 return false;
}
</SCRIPT>
</HEAD>

<BODY>

<FORM NAME="tester" ACTION="" METHOD="post" onSubmit="processRegex(this);return false">
    
<TABLE BORDER="1" CELLPADDING="4" CELLSPACING="0" WIDTH="550">
  <TR>
    <TH CLASS="Dialog">Regular Expression Tester</TH>
  </TR>
  <TR> 
    <TD CLASS="Dialog"> 

    <!--- Text input for the regular expression itself --->
    <SPAN CLASS="header">Enter a regular expression:</SPAN><BR>
    <INPUT NAME="RegEx" TYPE="Text" SIZE="65" STYLE="font-size:13px">

    <!--- Checkbox to control case-sensitivity --->
    <INPUT TYPE="Checkbox" NAME="CaseSensitive" ID="CaseSensitive" VALUE="Yes">
    <LABEL FOR="CaseSensitive">Case sensitive</LABEL>
    <BR>

    <!--- Radio buttons to display find vs. replace --->
    <INPUT TYPE="Radio" NAME="Operation" ID="OperationFind" VALUE="find" CHECKED onClick="hideReplaceFields()">
    <LABEL FOR="OperationFind">Find</LABEL>
    <INPUT TYPE="Radio" NAME="Operation" ID="OperationReplace" VALUE="replace" onClick="showReplaceFields()">
    <LABEL FOR="OperationReplace">Replace</LABEL>
    <BR>

    <!--- Text input for the replace regular expression --->
    <SPAN CLASS="header" ID="replaceheader">Enter the replace regular expression:</SPAN><BR>
    <INPUT ID="RegExReplace" NAME="RegExReplace" TYPE="Text" SIZE="65" STYLE="font-size:13px">
    <BR><BR>

    <!--- Textarea where user can type the text to search --->  
    <SPAN CLASS="header">And the text you wish to search:</SPAN><BR>
    <TEXTAREA NAME="SearchText" WRAP="off" COLS="70" ROWS="6"></TEXTAREA>
    <BR>

    <!--- Submit button to start the search --->  
    <INPUT NAME="Submit" TYPE="Submit" STYLE="font-weight:bold" VALUE="Match Now"></TD>
  </TR>
</TABLE>
  
</FORM>

<!-- Display any reults here --->
<SPAN id="output"></SPAN> 

<!-- Default to find --->
<SCRIPT LANGUAGE="JavaScript">
hideReplaceFields();
</SCRIPT>

</BODY>
</HTML>


本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/xiaoping8411/archive/2010/01/04/5127276.aspx
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