Question

我刚刚编写了下面的正则表达式。我在网页上有一个迷你富文本编辑器（非常类似于我用来发布这个问题的编辑器），我想使用双星号来指示哪些单词/短语应该包含在强标签中。目的是允许用户添加预定义的HTML元素，而无需实际提交HTML。

以下是单元测试：

<TestMethod()> Public Sub Regular_Expression_Replaces_Double_Asterix_With_Strong_Tags()

    'Arrange
    Dim originalString As String = "This the start of the text. **This should be wrapped with a strong tag**. But this part should **not**. ** Note: this part should be left alone since it isn't closed off."
    Dim htmlFormattedString As String = "This the start of the text. <strong>This should be wrapped with a strong tag</strong>. But this part should <strong>not</strong>. ** Note: this part should be left alone since it isn't closed off."

    'Act
    originalString = ItemTemplate.FormatTemplateToHtml(originalString)

    'Assert
    Assert.AreEqual(htmlFormattedString, originalString)

End Sub

这是工作代码：

Public Shared Function FormatTemplateToHtml(ByVal value As String) As String

    Dim formattedValue As String = value
    Dim pattern As String = "(\*{2})(.*?)(\*{2})"
    Dim regExMatches As MatchCollection = Regex.Matches(value, pattern)

    For Each regExMatch As Match In regExMatches

        'This is the part I feel could be improved?
        Dim replaceableTag As String = regExMatch.Groups(0).Value
        Dim reformattedTag As String = String.Format("<strong>{0}</strong>", regExMatch.Groups(2).Value)
        formattedValue = formattedValue.Replace(replaceableTag, reformattedTag)

    Next

    Return formattedValue

End Function

也许我过度优化了这一点，但我想知道这是否可以提高效率？

注意：我专业地使用VB.Net和C＃，所以即使这个例子是在VB.Net中（因为这个项目是用于VB.Net） C＃answers欢迎。

Answer 1

为什么不使用Replace方法？

Dim outputText As String =
    Regex.Replace(inputText, "\*{2}(.*?)\*{2}", "<strong>$1</strong>")

如何进一步优化此正则表达式？

1 个答案: