regex - Textmate片段格式化字符串（正则表达式？）

Question

我正在尝试创建一个 textmate 片段来转换它：

HELLO WORLD<br />
SAY ANYTHING

对此：

hello world say anything

有什么帮助吗？

Answer 1

在 Allan Odgaard 本人的帮助下：

片段

begin

  in:  ${1:Hello}

  out: ${1/\A\s+|\s+\Z|\s*\n\s*|(\<br\s*\/?\>)|(.)/(?1: :\L$2)/ig}

end

测试

begin

  in:  THIS IS<br />
  WORKING<BR>
  VERY NICELY<br/>

  EVEN WITH MULTIPLE<BR />
  LINE BREAKS!

  out: this is working very nicely even with multiple line breaks!

end

正则表达式匹配说明

\A      beginning of buffer
\s+     followed by one or more whitespace

|       OR

\s+     one or more whitespace
\Z      followed by end of buffer

|       OR

\s*     zero or more whitespace
\n      followed by newline
\s*     followed by zero or more whitespace

|       OR

(       Capture to 1
  <br   Literal `<br'
  \s*   followed by zero or more whitespace
  \/?   followed by one or zero literal `/'
  >     followed by literal `>'
)       End capture

|       OR

(       Capture to 2
  .     Any character
)       End capture

正则表达式替换说明

注意：条件替换是 TextMate 独有的

(?1:    IF Capture 1 is found
        Insert space (' ')
  :     ELSE
  \L$2  Insert lowercase(Capture 2)
)       ENDIF

正则表达式修饰符说明

i       case insensitive
g       global match/replace