regex - 如何通过函数或自定义函数在 Excel 中获得正则表达式支持？

Question

Excel 似乎不支持正则表达式(如正则表达式)，除非通过 VBA。是这样吗？如果是，是否有支持正则表达式的“开源”自定义 VBA 函数？在本例中，我希望提取字符串中的复杂模式，并且任何在函数本身中公开对正则表达式支持的自定义 VBA 函数的实现都将有用。如果您知道半相关功能，例如 IS函数，请随意发表评论，尽管我真的在寻找通过函数公开的完整正则表达式实现。

此外，请注意，我在 Windows 7 上使用 Office 2010；在一个看似很好的建议的答案被证明不适用于 Office 2010 后添加了此信息。

Answer 1

Excel 中没有内置任何内容。 VBScript 具有内置支持，可以从 VBA 调用。更多信息available here 。您可以使用 VBA 中的后期绑定(bind)来调用该对象。我包含了一些最近组合在一起的函数。请注意，这些没有经过充分测试，可能存在一些错误，但它们非常简单。

这至少应该让您开始:

'---------------------------------------------------------------------------------------vv
' Procedure : RegEx
' Author    : Mike
' Date      : 9/1/2010
' Purpose   : Perform a regular expression search on a string and return the first match
'               or the null string if no matches are found.
' Usage     : If Len(RegEx("\d{1,2}[/-]\d{1,2}[/-]\d{2,4}", txt)) = 0 Then MsgBox "No date in " & txt
'           : TheDate = RegEx("\d{1,2}[/-]\d{1,2}[/-]\d{2,4}", txt)
'           : CUSIP = Regex("[A-Za-z0-9]{8}[0-9]",txt)
'---------------------------------------------------------------------------------------
'^^
Function RegEx(Pattern As String, TextToSearch As String) As String 'vv
    Dim RE As Object, REMatches As Object

    Set RE = CreateObject("vbscript.regexp")
    With RE
        .MultiLine = False
        .Global = False
        .IgnoreCase = False
        .Pattern = Pattern
    End With

    Set REMatches = RE.Execute(TextToSearch)
    If REMatches.Count > 0 Then
        RegEx = REMatches(0)
    Else
        RegEx = vbNullString
    End If
End Function '^^

'---------------------------------------------------------------------------------------
' Procedure : RegExReplace
' Author    : Mike
' Date      : 11/4/2010
' Purpose   : Attempts to replace text in the TextToSearch with text and back references
'               from the ReplacePattern for any matches found using SearchPattern.
' Notes     - If no matches are found, TextToSearch is returned unaltered.  To get
'               specific info from a string, use RegExExtract instead.
' Usage     : ?RegExReplace("(.*)(\d{3})[\)\s.-](\d{3})[\s.-](\d{4})(.*)", "My phone # is 570.555.1234.", "$1($2)$3-$4$5")
'             My phone # is (570)555-1234.
'---------------------------------------------------------------------------------------
'
Function RegExReplace(SearchPattern As String, TextToSearch As String, ReplacePattern As String, _
                      Optional GlobalReplace As Boolean = True, _
                      Optional IgnoreCase As Boolean = False, _
                      Optional MultiLine As Boolean = False) As String
Dim RE As Object

    Set RE = CreateObject("vbscript.regexp")
    With RE
        .MultiLine = MultiLine
        .Global = GlobalReplace
        .IgnoreCase = IgnoreCase
        .Pattern = SearchPattern
    End With

    RegExReplace = RE.Replace(TextToSearch, ReplacePattern)
End Function

'---------------------------------------------------------------------------------------
' Procedure : RegExExtract
' Author    : Mike
' Date      : 11/4/2010
' Purpose   : Extracts specific information from a string.  Returns empty string if not found.
' Usage     : ?RegExExtract("(.*)(\d{3})[\)\s.-](\d{3})[\s.-](\d{4})(.*)", "My phone # is 570.555.1234.", "$2$3$4")
'             5705551234
'             ?RegExExtract("(.*)(\d{3})[\)\s.-](\d{3})[\s.-](\d{4})(.*)", "My name is Mike.", "$2$3$4")
'
'             ?RegExReplace("(.*)(\d{3})[\)\s.-](\d{3})[\s.-](\d{4})(.*)", "My name is Mike.", "$2$3$4")
'             My name is Mike.
'---------------------------------------------------------------------------------------
'
Function RegExExtract(SearchPattern As String, TextToSearch As String, PatternToExtract As String, _
                      Optional GlobalReplace As Boolean = True, _
                      Optional IgnoreCase As Boolean = False, _
                      Optional MultiLine As Boolean = False) As String
Dim MatchFound As Boolean

    MatchFound = Len(RegEx(SearchPattern, TextToSearch)) > 0
    If MatchFound Then
        RegExExtract = RegExReplace(SearchPattern, TextToSearch, PatternToExtract, _
                                    GlobalReplace, IgnoreCase, MultiLine)
    Else
        RegExExtract = vbNullString
    End If
End Function