这些不保留格式
首选方式（如果第 1 组不匹配，则产生 NULL）
在 golang 操场上有效 -
# https://play.golang.org/p/yKtPk5QCQV
# fmt.Println(reg.ReplaceAllString(txt, "$1"))
# (?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/|//[^\n]*(?:\n|$))|("[^"\\]*(?:\\[\S\s][^"\\]*)*"|'[^'\\]*(?:\\[\S\s][^'\\]*)*'|[\S\s][^/"'\\]*)
(?: # Comments
/\* # Start /* .. */ comment
[^*]* \*+
(?: [^/*] [^*]* \*+ )*
/ # End /* .. */ comment
|
// [^\n]* # Start // comment
(?: \n | $ ) # End // comment
)
|
( # (1 start), Non - comments
"
[^"\\]* # Double quoted text
(?: \\ [\S\s] [^"\\]* )*
"
|
'
[^'\\]* # Single quoted text
(?: \\ [\S\s] [^'\\]* )*
'
| [\S\s] # Any other char
[^/"'\\]* # Chars which doesn't start a comment, string, escape, or line continuation (escape + newline)
) # (1 end)
替代方式（第 1 组始终匹配，但可能为空）
在 golang 游乐场中有效 -
# https://play.golang.org/p/7FDGZSmMtP
# fmt.Println(reg.ReplaceAllString(txt, "$1"))
# (?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/|//[^\n]*(?:\n|$))?((?:"[^"\\]*(?:\\[\S\s][^"\\]*)*"|'[^'\\]*(?:\\[\S\s][^'\\]*)*'|[\S\s][^/"'\\]*)?)
(?: # Comments
/\* # Start /* .. */ comment
[^*]* \*+
(?: [^/*] [^*]* \*+ )*
/ # End /* .. */ comment
|
// [^\n]* # Start // comment
(?: \n | $ ) # End // comment
)?
( # (1 start), Non - comments
(?:
"
[^"\\]* # Double quoted text
(?: \\ [\S\s] [^"\\]* )*
"
|
'
[^'\\]* # Single quoted text
(?: \\ [\S\s] [^'\\]* )*
'
| [\S\s] # Any other char
[^/"'\\]* # Chars which doesn't start a comment, string, escape, or line continuation (escape + newline)
)?
) # (1 end)
Cadilac - 保留格式
（不幸的是，这不能在 Golang 中完成，因为 Golang 不能做断言）已
发布，以防您转移到不同的正则表达式引擎。
# raw: ((?:(?:^[ \t]*)?(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/(?:[ \t]*\r?\n(?=[ \t]*(?:\r?\n|/\*|//)))?|//(?:[^\\]|\\(?:\r?\n)?)*?(?:\r?\n(?=[ \t]*(?:\r?\n|/\*|//))|(?=\r?\n))))+)|("[^"\\]*(?:\\[\S\s][^"\\]*)*"|'[^'\\]*(?:\\[\S\s][^'\\]*)*'|(?:\r?\n|[\S\s])[^/"'\\\s]*)
# delimited: /((?:(?:^[ \t]*)?(?:\/\*[^*]*\*+(?:[^\/*][^*]*\*+)*\/(?:[ \t]*\r?\n(?=[ \t]*(?:\r?\n|\/\*|\/\/)))?|\/\/(?:[^\\]|\\(?:\r?\n)?)*?(?:\r?\n(?=[ \t]*(?:\r?\n|\/\*|\/\/))|(?=\r?\n))))+)|("[^"\\]*(?:\\[\S\s][^"\\]*)*"|'[^'\\]*(?:\\[\S\s][^'\\]*)*'|(?:\r?\n|[\S\s])[^\/"'\\\s]*)/
( # (1 start), Comments
(?:
(?: ^ [ \t]* )? # <- To preserve formatting
(?:
/\* # Start /* .. */ comment
[^*]* \*+
(?: [^/*] [^*]* \*+ )*
/ # End /* .. */ comment
(?: # <- To preserve formatting
[ \t]* \r? \n
(?=
[ \t]*
(?: \r? \n | /\* | // )
)
)?
|
// # Start // comment
(?: # Possible line-continuation
[^\\]
| \\
(?: \r? \n )?
)*?
(?: # End // comment
\r? \n
(?= # <- To preserve formatting
[ \t]*
(?: \r? \n | /\* | // )
)
| (?= \r? \n )
)
)
)+ # Grab multiple comment blocks if need be
) # (1 end)
| ## OR
( # (2 start), Non - comments
"
[^"\\]* # Double quoted text
(?: \\ [\S\s] [^"\\]* )*
"
|
'
[^'\\]* # Single quoted text
(?: \\ [\S\s] [^'\\]* )*
'
|
(?: \r? \n | [\S\s] ) # Linebreak or Any other char
[^/"'\\\s]* # Chars which doesn't start a comment, string, escape,
# or line continuation (escape + newline)
) # (2 end)