正则表达式:匹配除了:

a string starting with a specific pattern (e.g. any - empty, too - string not starting with foo): Lookahead-based solution for NFAs: ^(?!foo).*$ ^(?!foo) Negated character class based solution for regex engines not supporting lookarounds: ^(([^f].{2}|.[^o].|.{2}[^o]).*|.{0,2})$ ^([^f].{2}|.[^o].|.{2}[^o])|^.{0,2}$ a string ending with a specific pattern (say, no world. at the end): Lookbehind-based solution: (?<!world\.)$ ^.*(?<!world\.)$ Lookahead solution: ^(?!.*world\.$).* ^(?!.*world\.$) POSIX workaround: ^(.*([^w].{5}|.[^o].{4}|.{2}[^r].{3}|.{3}[^l].{2}|.{4}[^d].|.{5}[^.])|.{0,5})$ ([^w].{5}|.[^o].{4}|.{2}[^r].{3}|.{3}[^l].{2}|.{4}[^d].|.{5}[^.]$|^.{0,5})$ a string containing specific text (say, not match a string having foo): Lookaround-based solution: ^(?!.*foo) ^(?!.*foo).*$ POSIX workaround: Use the online regex generator at www.formauri.es/personal/pgimeno/misc/non-match-regex a string containing specific character (say, avoid matching a string having a | symbol): ^[^|]*$ a string equal to some string (say, not equal to foo): Lookaround-based: ^(?!foo$) ^(?!foo$).*$ POSIX: ^(.{0,2}|.{4,}|[^f]..|.[^o].|..[^o])$ a sequence of characters: PCRE (match any text but cat): /cat(*SKIP)(*FAIL)|[^c]*(?:c(?!at)[^c]*)*/i or /cat(*SKIP)(*FAIL)|(?:(?!cat).)+/is Other engines allowing lookarounds: (cat)|[^c]*(?:c(?!at)[^c]*)* (or (?s)(cat)|(?:(?!cat).)*, or (cat)|[^c]+(?:c(?!at)[^c]*)*|(?:c(?!at)[^c]*)+[^c]*) and then check with language means: if Group 1 matched, it is not what we need, else, grab the match value if not empty a certain single character or a set of characters: Use a negated character class: [^a-z]+ (any char other than a lowercase ASCII letter) Matching any char(s) but |: [^|]+

演示注意:换行符\n在演示中被使用在负字符类中，以避免匹配溢出到相邻的行。在测试单个字符串时，它们是不必要的。

锚注:在许多语言中，使用\A定义字符串的明确开头，使用\z(在Python中是\z，在JavaScript中是$)定义字符串的结尾。

点注:在许多口味(但不包括POSIX, TRE, TCL)，。匹配除换行字符以外的任何字符。确保你使用了相应的DOTALL修饰符(PCRE/Boost/ /s)。NET/Python/Java和Ruby中的/m)。匹配包含换行符的任何字符。

反斜杠注意:在语言中，你必须声明允许转义序列的C字符串模式(如\n表示换行符)，你需要双反斜杠来转义特殊字符，以便引擎可以将它们视为字面字符(例如在Java中，world\。将被声明为"world\\."，或者使用字符类:"world[.]")。使用原始字符串字面量(Python r'\bworld\b')， c#逐字字符串字面量@"world\."，或斜杠字符串/正则表达式字面量符号，如/world\./。

你可以在字符集的开头加上^来匹配除这些字符以外的任何字符。

[^=]*

将匹配除=

在Python中:

>>> import re
>>> p='^(?!index\.php\?[0-9]+).*$'
>>> s1='index.php?12345'
>>> re.match(p,s1)
>>> s2='index.html?12345'
>>> re.match(p,s2)
<_sre.SRE_Match object at 0xb7d65fa8>

正则表达式:匹配除了:

a string starting with a specific pattern (e.g. any - empty, too - string not starting with foo): Lookahead-based solution for NFAs: ^(?!foo).*$ ^(?!foo) Negated character class based solution for regex engines not supporting lookarounds: ^(([^f].{2}|.[^o].|.{2}[^o]).*|.{0,2})$ ^([^f].{2}|.[^o].|.{2}[^o])|^.{0,2}$ a string ending with a specific pattern (say, no world. at the end): Lookbehind-based solution: (?<!world\.)$ ^.*(?<!world\.)$ Lookahead solution: ^(?!.*world\.$).* ^(?!.*world\.$) POSIX workaround: ^(.*([^w].{5}|.[^o].{4}|.{2}[^r].{3}|.{3}[^l].{2}|.{4}[^d].|.{5}[^.])|.{0,5})$ ([^w].{5}|.[^o].{4}|.{2}[^r].{3}|.{3}[^l].{2}|.{4}[^d].|.{5}[^.]$|^.{0,5})$ a string containing specific text (say, not match a string having foo): Lookaround-based solution: ^(?!.*foo) ^(?!.*foo).*$ POSIX workaround: Use the online regex generator at www.formauri.es/personal/pgimeno/misc/non-match-regex a string containing specific character (say, avoid matching a string having a | symbol): ^[^|]*$ a string equal to some string (say, not equal to foo): Lookaround-based: ^(?!foo$) ^(?!foo$).*$ POSIX: ^(.{0,2}|.{4,}|[^f]..|.[^o].|..[^o])$ a sequence of characters: PCRE (match any text but cat): /cat(*SKIP)(*FAIL)|[^c]*(?:c(?!at)[^c]*)*/i or /cat(*SKIP)(*FAIL)|(?:(?!cat).)+/is Other engines allowing lookarounds: (cat)|[^c]*(?:c(?!at)[^c]*)* (or (?s)(cat)|(?:(?!cat).)*, or (cat)|[^c]+(?:c(?!at)[^c]*)*|(?:c(?!at)[^c]*)+[^c]*) and then check with language means: if Group 1 matched, it is not what we need, else, grab the match value if not empty a certain single character or a set of characters: Use a negated character class: [^a-z]+ (any char other than a lowercase ASCII letter) Matching any char(s) but |: [^|]+

演示注意:换行符\n在演示中被使用在负字符类中，以避免匹配溢出到相邻的行。在测试单个字符串时，它们是不必要的。

锚注:在许多语言中，使用\A定义字符串的明确开头，使用\z(在Python中是\z，在JavaScript中是$)定义字符串的结尾。

点注:在许多口味(但不包括POSIX, TRE, TCL)，。匹配除换行字符以外的任何字符。确保你使用了相应的DOTALL修饰符(PCRE/Boost/ /s)。NET/Python/Java和Ruby中的/m)。匹配包含换行符的任何字符。

反斜杠注意:在语言中，你必须声明允许转义序列的C字符串模式(如\n表示换行符)，你需要双反斜杠来转义特殊字符，以便引擎可以将它们视为字面字符(例如在Java中，world\。将被声明为"world\\."，或者使用字符类:"world[.]")。使用原始字符串字面量(Python r'\bworld\b')， c#逐字字符串字面量@"world\."，或斜杠字符串/正则表达式字面量符号，如/world\./。

您可以从一开始就使用负向前，例如，^(?!foo)。*$不应该匹配以foo开头的任何内容。

只需匹配/^index\.php/，然后拒绝匹配它的任何东西。