Utf8 forl中的CamelCase(WikiWord)的正确正则表达式

Question

这是一个关于CamelCase正则表达式的问题.随着tchrist post的组合,我想知道什么是正确的utf-8 CamelCase.

从(brian d foy's)正则表达式开始:

/
    \b          # start at word boundary
    [A-Z]       # start with upper
    [a-zA-Z]*   # followed by any alpha

    (?:  # non-capturing grouping for alternation precedence
       [a-z][a-zA-Z]*[A-Z]   # next bit is lower, any zero or more, ending with upper
          |                     # or 
       [A-Z][a-zA-Z]*[a-z]   # next bit is upper, any zero or more, ending with lower
    )

    [a-zA-Z]*   # anything that's left
    \b          # end at word 
/x

并修改为:

/
    \b          # start at word boundary
    \p{Uppercase_Letter}     # start with upper
    \p{Alphabetic}*          # followed by any alpha

    (?:  # non-capturing grouping for alternation precedence
       \p{Lowercase_Letter}[a-zA-Z]*\p{Uppercase_Letter}   ### next bit is lower, any zero or more, ending with upper
          |                  # or 
       \p{Uppercase_Letter}[a-zA-Z]*\p{Lowercase_Letter}   ### next bit is upper, any zero or more, ending with lower
    )

    \p{Alphabetic}*          # anything that's left
    \b          # end at word 
/x

标有"###"的行有问题.

另外,假设比数字和下划线等同于小写字母时如何修改正则表达式,因此W2X3是一个有效的CamelCase单词.

更新:(ysth评论)

为了下一个,

• any:表示"大写或小写或数字或下划线"

正则表达式应该与CamelWord,CaW相匹配

• 以大写字母开头
• 可选任何
• 小写字母或数字或下划线
• 可选任何
• 大写字母
• 可选任何

请不要标记为重复,因为它不是.在原来的问题(和答案太)认为只有ASCII.

Answer 1

我真的不知道你要做什么,但这应该更接近你原来的意图.不过,我仍然无法说出你的意思.

m{
    \b
    \p{Upper}      #  start with uppercase code point (NOT LETTER)

    \w*            #  optional ident chars 

    # note that upper and lower are not related to letters
    (?:  \p{Lower} \w* \p{Upper}
      |  \p{Upper} \w* \p{Lower}
    )

    \w*

    \b
}x

切勿使用[a-z].事实上,不要使用\p{Lowercase_Letter}或\p{Ll},因为那些不是更理想和更正确的\p{Lowercase}和\p{Lower}.

请记住,这\w只是一个别名

[\p{Alphabetic}\p{Mark}\p{Decimal_Number}\p{Letter_Number}\p{Connector_Punctuation}]