VBA使用正则表达式将希腊语单词作为整个单词匹配 [英] VBA match Greek words as whole words using regular expression

问题描述

我正在尝试以正则表达式模式匹配希腊字符.似乎VBA在支持Unicode方面非常有限，但如果可能的话，我可以使用ASCII.这是示例代码:

I am trying to match greek characters in a regex pattern. It seems that VBA is quite limited on supporting Unicode, but I can do with ASCII if possible. Here is a sample code:

Sub TestGreekRegEx()
Dim str 
str = "αυτό είναι ένα ελληνικό κείμενο"
Set regEx = CreateObject("vbscript.regexp")
regEx.Pattern = "\b[\xe1-\xfe]+\b"
Set Matches = regEx.Execute(str)
For Each Match In Matches
    MsgBox Match
Next
End Sub

此命令完全不返回任何匹配项.另外，如果我循环输入str的字符，则我得到的ASCII码在\ xE1到\ xFE的范围内.

This return no matches at all. Also, if I loop in the str's character the ASCII codes that I get is within the range of \xE1 to \xFE.

谢谢

推荐答案

不考虑希腊字符Unicode字符范围，您还有另一个问题:\b在ECMAScript 5标准中，只有ASCII匹配边界.

Leaving the Greek char Unicode character range aside, you have another problem: \b in ECMAScript 5 standard only ASCII matches boundaries.

因此，无论您使用哪种希腊语单词模式[\u00E1-\u03CE]+或[\xE1-\xFE]+，如果在两端添加\b，都不会匹配.

Thus, whatever Greek word pattern works for you, [\u00E1-\u03CE]+ or [\xE1-\xFE]+, if you add \bs on both ends, you won't get a match.

因此，您需要做的是使用一个组(左侧)和一个前瞻(右侧)建立自定义边界.要提取单词，您需要访问每个匹配项的.Submatches属性.

So, what you need to do is build custom boundaries using a group (on the left) and a lookahead (on the right). To extract the words, you will need to access the .Submatches property of each match.

我没有为非Unicode文件设置希腊语设置，所以让我想象一下您的单词模式是[\xE1-\xFE]+.然后，您的提取正则表达式将如下所示:

I do not have Greek language settings set for non-Unicode files, so let me imaging your word pattern is [\xE1-\xFE]+. Then, your extracting regex will look like

(?:^|[^_0-9\xE1-\xFE])([\xE1-\xFE]+)(?![_0-9\xE1-\xFE])

使用[\u00E1-\u03CE]+模式，它将看起来像

With [\u00E1-\u03CE]+ pattern, it will look like

(?:^|[^_0-9\u00E1-\u03CE])([\u00E1-\u03CE]+)(?![_0-9\u00E1-\u03CE])

请注意，我模仿的是\b字边界，其左侧为(?:^|[^_0-9\xE1-\xFE])(它匹配字符串的开头或任何字符但_，数字和您字符范围内的字母)和右侧的(?![_0-9\xE1-\xFE])(没有数字，_，并且在单词匹配模式之后立即允许使用您的字符).请注意，单词匹配模式会用括号括起来，以捕获成组. 问题"是非捕获组((?:^|[^_0-9\xE1-\xFE]))匹配也将落入结果中.这就是为什么我们需要访问.Submatches:

Note I am imitating \b word boundaries with (?:^|[^_0-9\xE1-\xFE]) on the left (it matches start of string or any char BUT _, digit and the letter from your character range) and (?![_0-9\xE1-\xFE]) on the right (no digit, _ and your chars allowed right after the word matching pattern). Note the word matching pattern is wrapped with parentheses to capture it into a group. The "problem" is that the non-capturing group ((?:^|[^_0-9\xE1-\xFE])) match also lands in the result. That is why we need to access .Submatches:

Sub TestGreekRegEx()
Dim str 
str = "YOUR_NON_ASCII_STRING_HERE"
Set regEx = CreateObject("vbscript.regexp")
regEx.Pattern = "(?:^|[^_0-9\xE1-\xFE])([\xE1-\xFE]+)(?![_0-9\xE1-\xFE])"
Set Matches = regEx.Execute(str)
For Each Match In Matches
    MsgBox Match.Submatches(0)  ' <--- See here
Next
End Sub

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