也谈正则表达式

其实很早就知道了正则表达式，在集成VBScript脚本的时候，就看到了该功能，不过那时觉得很难，觉得也派不上什么用场，所以也没有过多关注。

最近看了<personname productid="孟岩" w:st="on">孟岩</personname>老师的关于正则表达式讲解，有一种学习正则表达式的冲动，适时我们开发的项目中需要嵌入Python脚本功能，需要一个脚本编辑器，关键字变色等等相关功能用正则表达式实现相对容易的多。

前段时间买了本红皮书《C#字符串和正则表达式参考书》（这真是一本好书，想学习正则表达式的可以参考一下），花了几天的时间把该书看了一遍，正则表达式的用法基本上也弄清楚了，并且对字符串相关的知识也越来越感兴趣了。

对正则表达式的具体规则和使用，实没有什么可说的，网上的文章多的很，都说的比我的好。这是我学习正则表达式做的一个简单正则表达式测试工具，其实大部分代码就是上面书的一个示例（不知道为什么，上网竟没有找到该书的示例源码），又上网查了一些资料，把一些常见的正则表达式也嵌入了进去，方便了正则表达式的应用（以后有时间做一个比较理想的正则表达式工具）。

这是程序的截图：

相关源码：

// 获取正则表达式的匹配参数
private RegexOptionsGetSelectedRegexOptions()
{
RegexOptionsselectedRegexOptions = RegexOptions.None;

if ( this .IgnoreCaseChkBox.Checked)
selectedRegexOptions |= RegexOptions.IgnoreCase;
if ( this .ExplicitCaptureChkBox.Checked)
selectedRegexOptions |= RegexOptions.ExplicitCapture;
if ( this .ECMAScriptChkBox.Checked)
selectedRegexOptions |= RegexOptions.ECMAScript;
if ( this .IgnoreCaseChkBox.Checked)
selectedRegexOptions |= RegexOptions.IgnoreCase;
if ( this .MultiLineChkBox.Checked)
selectedRegexOptions |= RegexOptions.Multiline;
if ( this .RightToLeftChkBox.Checked)
selectedRegexOptions |= RegexOptions.RightToLeft;
if ( this .SingeLineChkBox.Checked)
selectedRegexOptions |= RegexOptions.Singleline;
return selectedRegexOptions;

}

private void TestRegexButton_Click( object sender,EventArgse)
{
try
{
RegexOptionsselectedRegexOptions = this .GetSelectedRegexOptions();
RegextestRegex = new Regex( this .RegexTextBox.Text,selectedRegexOptions);
if (testRegex.IsMatch( this .InputTextBox.Text))
{
this .ResultsTextBox.ForeColor = Color.Black;
this .ResultsTextBox.Text = " 匹配成功 " ;
}
else
{
this .ResultsTextBox.ForeColor = Color.Red;
this .ResultsTextBox.Text = " 匹配失败 " ;
}
}
catch (ArgumentExceptionex)
{
this .ResultsTextBox.ForeColor = Color.Red;
this .ResultsTextBox.Text = " 错误： " + ex.Message;
}
}

private void ReplaceButton_Click( object sender,EventArgse)
{
try
{
RegexOptionsselectedRegexOptions = this .GetSelectedRegexOptions();
RegexreplaceRegex = new Regex( this .RegexTextBox.Text,selectedRegexOptions);

this .ResultsTextBox.ForeColor = Color.Black;
this .ResultsTextBox.Text = replaceRegex.Replace( this .InputTextBox.Text, this .ReplacementTextBox.Text);

}
catch (ArgumentExceptionex)
{
this .ResultsTextBox.ForeColor = Color.Red;
this .ResultsTextBox.Text = " 错误： " + ex.Message;
}
}

private void SplitBoutton_Click( object sender,EventArgse)
{
try
{
RegexOptionsselectedRegexOptions = this .GetSelectedRegexOptions();
RegexsplitRegex = new Regex( this .RegexTextBox.Text,selectedRegexOptions);

String[]splitResults;
splitResults = splitRegex.Split( this .InputTextBox.Text);
StringBuilderresultsString = new StringBuilder( this .InputTextBox.Text.Length);

foreach (StringstringElement in splitResults)
resultsString.Append(stringElement + Environment.NewLine);

this .ResultsTextBox.ForeColor = Color.Black;
this .ResultsTextBox.Text = resultsString.ToString();
}
catch (ArgumentExceptionex)
{
this .ResultsTextBox.ForeColor = Color.Red;
this .ResultsTextBox.Text = " 错误： " + ex.Message;
}

}

private void MatchesButton_Click( object sender,EventArgse)
{
try
{
RegexOptionsselectedRegexOptions = this .GetSelectedRegexOptions();
RegexmatchesRegex = new Regex( this .RegexTextBox.Text,selectedRegexOptions);

MatchCollectionmatchesFound;
matchesFound = matchesRegex.Matches( this .InputTextBox.Text);

StringnextMath = " -------下一个匹配项---------- " ;
StringBuilderresultsString = new StringBuilder( 64 );

foreach (MatchmatchMode in matchesFound)
resultsString.Append(matchMode.Value + (Environment.NewLine + nextMath));

this .ResultsTextBox.ForeColor = Color.Black;
this .ResultsTextBox.Text = resultsString.ToString();
}
catch (ArgumentExceptionex)
{
this .ResultsTextBox.ForeColor = Color.Red;
this .ResultsTextBox.Text = " 错误： " + ex.Message;
}

}

private void GroupsButton_Click( object sender,EventArgse)
{
try
{
RegexOptionsselectedRegexOptions = this .GetSelectedRegexOptions();
RegexmatchesRegex = new Regex( this .RegexTextBox.Text,selectedRegexOptions);

MatchCollectionmatchesFound;
matchesFound = matchesRegex.Matches( this .InputTextBox.Text);

StringnextMath = " -------下一个分组---------- " ;
StringBuilderresultsString = new StringBuilder( 64 );
GroupCollectionmatchGroups;


foreach (MatchmatchMode in matchesFound)
{
matchGroups = matchMode.Groups;
foreach (GroupmatchGroup in matchGroups)
resultsString.Append( " ( " + matchGroup.Value + " ) " );
resultsString.Append(Environment.NewLine + nextMath);
}

this .ResultsTextBox.ForeColor = Color.Black;
this .ResultsTextBox.Text = resultsString.ToString();
}
catch (ArgumentExceptionex)
{
this .ResultsTextBox.ForeColor = Color.Red;
this .ResultsTextBox.Text = " 错误： " + ex.Message;
}
}

// 常见正则表达式
private void FamiliarRegex_LinkClicked( object sender,LinkLabelLinkClickedEventArgse)
{
MenuRegex.Show( this , new Point(FamiliarRegex.Location.X,FamiliarRegex.Location.Y + FamiliarRegex.Size.Height));
// MessageBox.Show("sdfsd");
}

private void MenuRegexItem_Click( object sender,EventArgse)
{
string strRegex = "" ;
switch (((ToolStripMenuItem)sender).Text)
{
case " 整数 " :
strRegex = @" ^((+|-)d)?d*$ " ;
break ;
case " 浮点数 " :
strRegex = @" ^(?:+|-)?d+(?:.d+)?$ " ;
break ;
case " 电话号码 " :
strRegex = @" d{3}-d{8}|d{4}-d{7} " ;
break ;
case " 邮政编码 " :
strRegex = @" [1-9]d{5}(?!d) " ;
break ;
case " Email地址1 " :
strRegex = @" ^(([^<>()[]/.,;:@ " + ' " ' + @"

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