本次示例效果如下:
TextBox1中输入如下字符串:
12<table><tbody><tr><td>1<br/>11</td><td>a</td></tr><tr><td>2</td><td>b</td></tr></tbody></table>
34<table><tbody><tr><td>3</td><td>c</td></tr><tr><td>4</td><td>d</td></tr></tbody></table>
点击按钮, 转换第一个tr下面的td为tr 将TextBox1中的table中第一个tr下面的td 转换成th ,将结果显示在TextBox2中
12<table><tbody><tr><th>1<br/>11</th><th>a</th></tr><tr><td>2</td><td>b</td></tr></tbody></table>
34<table><tbody><tr><th>3</th><th>c</th></tr><tr><td>4</td><td>d</td></tr></tbody></table>
转换第一个tr下面的tr为td 将TextBox2中的table中第一个tr下面的th 转换成td ,将结果显示在TextBox3中
12<table><tbody><tr><th>1<br/>11</th><th>a</th></tr><tr><td>2</td><td>b</td></tr></tbody></table>
34<table><tbody><tr><th>3</th><th>c</th></tr><tr><td>4</td><td>d</td></tr></tbody></table>
相关代码如下:
Imports System.Text.RegularExpressions Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox2.Text = ConvertFirstTrTdToTh(TextBox1.Text.Trim) TextBox3.Text = ConvertFirstTrThToTd(TextBox2.Text.Trim) End Sub Public Function ConvertFirstTrTdToTh(ByVal strContent As String) As String Dim strOld As String = strContent.Trim 'RegexOptions.Singleline 模式下 .代替任何字符 包括回车换行 Dim regexTable As New Regex("<tbody[^>]*>(.+?)</tr>", RegexOptions.Singleline) Dim regexFirstTr As New Regex("<tr[^>]*>(.+?)</tr>", RegexOptions.Singleline) Dim regexTd As New Regex("<td[^>]*>(?<tdContent>.+?)</td>", RegexOptions.Singleline) For Each mTable As Match In regexTable.Matches(strOld) Dim strFirstTr As String = regexFirstTr.Match(mTable.Value).Value 'For Each mTd As Match In regexTd.Matches(strFirstTr) Dim strTdTh As String = regexTd.Replace(strFirstTr, "<th>${tdContent}</th>") 'Next strOld = New Regex(strFirstTr).Replace(strOld, strTdTh, 1) Next ConvertFirstTrTdToTh = strOld End Function Public Function ConvertFirstTrThToTd(ByVal strContent As String) As String Dim strOld As String = strContent.Trim Dim regexTable As New Regex("<tbody[^>]*>(.+?)</tr>", RegexOptions.Singleline) Dim regexFirstTr As New Regex("<tr[^>]*>(.+?)</tr>", RegexOptions.Singleline) Dim regexTd As New Regex("<th[^>]*>(?<tdContent>.+?)</th>", RegexOptions.Singleline) For Each mTable As Match In regexTable.Matches(strOld) 'Dim mgFirstTr As MatchCollection = regexFirstTr.Matches(mTable.Value) Dim strFirstTr As String = regexFirstTr.Match(mTable.Value).Value 'For Each mTd As Match In regexTd.Matches(strFirstTr) Dim strTdTh As String = regexTd.Replace(strFirstTr, "<td>${tdContent}</td>") 'Next strOld = New Regex(strFirstTr).Replace(strOld, strTdTh, 1) Next ConvertFirstTrThToTd = strOld End Function End Class