powershell正则表达式匹配特定字符串，不包含起始特殊字符

Question

我有一个与regex匹配的字符串，但同一个字符串前面用#号注释掉了，regex一直与它匹配，这是我不希望的。

我的Regex

BLTY:w{8}:w{8}:w{5}.w{7}.w{1}.w{3}/w{3}/.*(w{4})

字符串

BLTY:ENCQ0000:SERVER:TEMP.PPMQ8FE.Y.323/TCP/gtg23.dev.pmt.com(3213)-> only match this
#BLTY:ENCQ0000:SERVER:TEMP.PPMQ8FE.Y.323/TCP/gtg23.dev.pmt.com(3213) -> I dont want to match this

尝试

^[BLTY:w{8}:w{8}:w{5}.w{7}.w{1}.w{3}/w{3}/.*(w{4})]
^BLTY:w{8}:w{8}:w{5}.w{7}.w{1}.w{3}/w{3}/.*(w{4})
(?!#)BLTY:w{8}:w{8}:w{5}.w{7}.w{1}.w{3}/w{3}/.*(w{4})

此外，如果有一种不那么冗长/优化的方式来编写这个正则表达式，我愿意听取

Answer 1

无需使用lookahead：

^BLTY(?::w+){3}(?:.w+){3}/.*(d+)$

请参阅正则表达式证明。

解释

--------------------------------------------------------------------------------
^                        the beginning of the string
--------------------------------------------------------------------------------
BLTY                     'BLTY'
--------------------------------------------------------------------------------
(?:                      group, but do not capture (3 times):
--------------------------------------------------------------------------------
:                        ':'
--------------------------------------------------------------------------------
w+                      word characters (a-z, A-Z, 0-9, _) (1 or
more times (matching the most amount
possible))
--------------------------------------------------------------------------------
){3}                     end of grouping
--------------------------------------------------------------------------------
(?:                      group, but do not capture (3 times):
--------------------------------------------------------------------------------
.                       '.'
--------------------------------------------------------------------------------
w+                      word characters (a-z, A-Z, 0-9, _) (1 or
more times (matching the most amount
possible))
--------------------------------------------------------------------------------
){3}                     end of grouping
--------------------------------------------------------------------------------
/                        '/'
--------------------------------------------------------------------------------
.*                       any character except n (0 or more times
(matching the most amount possible))
--------------------------------------------------------------------------------
(                       '('
--------------------------------------------------------------------------------
d+                      digits (0-9) (1 or more times (matching
the most amount possible))
--------------------------------------------------------------------------------
)                       ')'
--------------------------------------------------------------------------------
$                        before an optional n, and the end of the
string