Question

我有一个解析PAWN语言代码的解析器。

我已经有一个正则表达式解析代码中的定义，典型的定义如下：

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我使用以下正则表达式来检测它：

#define DEFINE_NAME DEFINE_VALUE

现在解决实际问题.. PAWN语言只允许多行，如果每行以斜杠结束..所以这是有效的：

#define[ \t]+([^\n\r\s\\;]+)(?:[ \t]*([^\s;]+))?

如果有更多斜线，可以继续。

Soo ..我想要一个正则表达式，可以捕获这样的可能的多行内容。

注意：我还需要它在单行定义中工作..所以请记住这一点。

我也使用.NET，所以这就是风味。

非常感谢任何帮助/贡献。：d

Answer 1

我们可以包含可选的斜杠和换行符：

(?:\\\r?\n[ \t]*)?

然后，为了允许多个以斜杠结尾的行，我们可以重复以下构造：

(?<value>(?>                  # Captures the DEFINE_VALUE
    [^\\\r\n;]+               #   Any char (except \ \n)
  |                           #  or
    \\[^\r\n][^\\\r\n;]*      #   "\" within value
)+)?                          #  (~unrolling the loop)
(?:\\\r?\n[ \t]*)?            # allow "\" for new line

<强>代码

Dim pattern As String = "^[ \t]*                    # beginning of line     " & vbCrLf &
                        "[#]define[ \t]+            # PAWN #define          " & vbCrLf &
                        "(?<name>[^\s\\;]+)         # DEFINE_NAME           " & vbCrLf &
                        "[ \t]*(?:\\\r?\n[ \t]*)?   # spaces and optional \ " & vbCrLf &
                        "(?>                        #                       " & vbCrLf &
                        "  (?<value>(?>             # DEFINE_VALUE          " & vbCrLf &
                        "    [^\\\r\n;]+   |        #  Any char -except \ \n" & vbCrLf &
                        "    \\[^\r\n][^\\\r\n;]*   #  \ within value       " & vbCrLf &
                        "  )+)?                     #  (~unrolling the loop)" & vbCrLf &
                        "  (?:\\\r?\n[ \t]*)?       # \ for new line        " & vbCrLf &
                        ")*                         # repeated for each line"

Dim re As Regex = new Regex( pattern, RegexOptions.Multiline Or
                                      RegexOptions.IgnorePatternWhitespace)
Dim text As String =    "#define DEFINE_NAME \"     & vbCrLf &
                        "       DEFINE VALUE\"      & vbCrLf &
                        "       CONTINUE VALUE"     & vbCrLf &
                        "#define TheName TheValue"
Dim mNum As Integer = 0
Dim matches As MatchCollection = re.Matches(text)

'Loop Matches
For Each match As Match In matches
    'get name
    Dim name As String = match.Groups("name").Value
    Console.WriteLine("Match #{0} - Name: {1}", mNum, name)

    'get values (in each capture)
    Dim captureCtr As Integer = 0
    For Each capture As Capture In match.Groups("value").Captures
        'loop captures for the Group "value"
        Console.WriteLine(vbTab & "Line #{0} - Value: {1}", 
                                captureCtr, capture.Value)
        captureCtr += 1              
    Next
    mNum += 1
Next

<强>输出

Match #0 - Name: DEFINE_NAME
    Line #0 - Value: DEFINE_VALUE
    Line #1 - Value: CONTINUE_VALUE
Match #1 - Name: TheName
    Line #0 - Value: TheValue

ideone demo

请注意，我正在使用named groups (?<name>..)和(?<value>..)。这就是为什么它在代码中引用为match.Groups("name")。
此外，每行重复组(?<value>[^\s;]+)。 Groups("value")包含有关最后捕获的子字符串的信息。但 Captures property 包含有关该组捕获的所有子字符串的信息。这是一个独特的.net功能这就是我循环match.Groups("value").Captures。

用于检测多行文本的正则表达式，如果以字符结尾

1 个答案: