基准

我决定评估一些提交的选项,并比较其性能,以及使用一些新功能。

参考文本:

第一 7 行不应匹配,因为它们包含所搜索的表达式,而下 7 行应匹配!

Regex Hero is a real-time online Silverlight Regular Expression Tester.
XRegex Hero is a real-time online Silverlight Regular Expression Tester.
Regex HeroRegex HeroRegex HeroRegex HeroRegex Hero is a real-time online Silverlight Regular Expression Tester.
Regex Her Regex Her Regex Her Regex Her Regex Her Regex Her Regex Hero is a real-time online Silverlight Regular Expression Tester.
Regex Her is a real-time online Silverlight Regular Expression Tester.Regex Hero
egex Hero egex Hero egex Hero egex Hero egex Hero egex Hero Regex Hero is a real-time online Silverlight Regular Expression Tester.
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRegex Hero is a real-time online Silverlight Regular Expression Tester.

Regex Her
egex Hero
egex Hero is a real-time online Silverlight Regular Expression Tester.
Regex Her is a real-time online Silverlight Regular Expression Tester.
Regex Her Regex Her Regex Her Regex Her Regex Her Regex Her is a real-time online Silverlight Regular Expression Tester.
Nobody is a real-time online Silverlight Regular Expression Tester.
Regex Her o egex Hero Regex  Hero Reg ex Hero is a real-time online Silverlight Regular Expression Tester.

结果:

结果是每秒以 3 轮的平均值 - 大数 = 更好

01: ^((?!Regex Hero).)*$                    3.914   // Accepted Answer
02: ^(?:(?!Regex Hero).)*$                  5.034   // With Non-Capturing group
03: ^(?!.*?Regex Hero).*                   7.356   // Lookahead at the beginning, if not found match everything
04: ^(?>[^R]+|R(?!egex Hero))*$             6.137   // Lookahead only on the right first letter
05: ^(?>(?:.*?Regex Hero)?)^.*$             7.426   // Match the word and check if you're still at linestart
06: ^(?(?=.*?Regex Hero)(?#fail)|.*)$       7.371   // Logic Branch: Find Regex Hero? match nothing, else anything

P1: ^(?(?=.*?Regex Hero)(*FAIL)|(*ACCEPT))  ?????   // Logic Branch in Perl - Quick FAIL
P2: .*?Regex Hero(*COMMIT)(*FAIL)|(*ACCEPT) ?????   // Direct COMMIT & FAIL in Perl

由于.NET 不支持操作 Verbs (*FAIL 等) 我无法测试 P1 和 P2 解决方案。

总结:

总的来说,最可读和最快的解决方案似乎是03与一个简单的负面视图,这也是JavaScript的最快的解决方案,因为JS不支持其他解决方案的更先进的Regex功能。

^((?!hede).)*$

而且,如果你需要匹配线打破车也,使用DOT-ALL修改器(在下面的模式中的跟踪器):

/^((?!hede).)*$/s

或使用 inline:

/(?s)^((?!hede).)*$/

如果 DOT-ALL 修改器不适用,您可以模拟相同的行为与字符类 [\s\S]:

/^((?!hede)[\s\S])*$/

解释

    ┌──┬───┬──┬───┬──┬───┬──┬───┬──┬───┬──┬───┬──┬───┬──┬───┬──┐
S = │e1│ A │e2│ B │e3│ h │e4│ e │e5│ d │e6│ e │e7│ C │e8│ D │e9│
    └──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┘
    
index    0      1      2      3      4      5      6      7

在哪里是e的是空的线条. 雷格斯(?!hede)看向前看,看看是否没有任何字符的“hede”可以看到,如果是这样的情况(所以另一个东西可以看到),那么.(dot)将匹配任何字符,除了线条中断。

正如你可以看到的,输入“ABhedeCD”将失败,因为在e3上, regex(?!hede)失败(有“hede”在前面!)。

^hede$(*SKIP)(*F)|^.*$

这将完全滑动包含准确的线条的线条,并匹配所有剩下的线条。

演示

符号前的部分. 符号不应匹配. ^hede$(*SKIP)(*F) 符号后的部分. 符号应匹配。

第一部分

^hede$(*SKIP)(*F)

解释:

因此,包含字符串的线条将被匹配. 一旦雷格斯发动机看到以下 (*SKIP)(*F)(注:你可以写 (*F)作为 (*FAIL))字符,它滑动并使匹配失败。

第2部分

^.*$

解释:

它可能更可维持在您的代码中的两个规则,一个进行第一场比赛,然后如果它匹配运行第二个规则,以检查您想要阻止的其他案例,例如 ^.*(hede)。* 然后在您的代码中有适当的逻辑。

好吧,我承认这不是一个真正的答案发表的问题,它也可能使用一些更多的处理,而不是一个单一的 regex. 但对于开发人员谁来到这里寻找一个快速紧急修复的另一个案例,那么这个解决方案不应该被忽视。

基准

我决定评估一些提交的选项,并比较其性能,以及使用一些新功能。

参考文本:

第一 7 行不应匹配,因为它们包含所搜索的表达式,而下 7 行应匹配!

Regex Hero is a real-time online Silverlight Regular Expression Tester.
XRegex Hero is a real-time online Silverlight Regular Expression Tester.
Regex HeroRegex HeroRegex HeroRegex HeroRegex Hero is a real-time online Silverlight Regular Expression Tester.
Regex Her Regex Her Regex Her Regex Her Regex Her Regex Her Regex Hero is a real-time online Silverlight Regular Expression Tester.
Regex Her is a real-time online Silverlight Regular Expression Tester.Regex Hero
egex Hero egex Hero egex Hero egex Hero egex Hero egex Hero Regex Hero is a real-time online Silverlight Regular Expression Tester.
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRegex Hero is a real-time online Silverlight Regular Expression Tester.

Regex Her
egex Hero
egex Hero is a real-time online Silverlight Regular Expression Tester.
Regex Her is a real-time online Silverlight Regular Expression Tester.
Regex Her Regex Her Regex Her Regex Her Regex Her Regex Her is a real-time online Silverlight Regular Expression Tester.
Nobody is a real-time online Silverlight Regular Expression Tester.
Regex Her o egex Hero Regex  Hero Reg ex Hero is a real-time online Silverlight Regular Expression Tester.

结果:

结果是每秒以 3 轮的平均值 - 大数 = 更好

01: ^((?!Regex Hero).)*$                    3.914   // Accepted Answer
02: ^(?:(?!Regex Hero).)*$                  5.034   // With Non-Capturing group
03: ^(?!.*?Regex Hero).*                   7.356   // Lookahead at the beginning, if not found match everything
04: ^(?>[^R]+|R(?!egex Hero))*$             6.137   // Lookahead only on the right first letter
05: ^(?>(?:.*?Regex Hero)?)^.*$             7.426   // Match the word and check if you're still at linestart
06: ^(?(?=.*?Regex Hero)(?#fail)|.*)$       7.371   // Logic Branch: Find Regex Hero? match nothing, else anything

P1: ^(?(?=.*?Regex Hero)(*FAIL)|(*ACCEPT))  ?????   // Logic Branch in Perl - Quick FAIL
P2: .*?Regex Hero(*COMMIT)(*FAIL)|(*ACCEPT) ?????   // Direct COMMIT & FAIL in Perl

由于.NET 不支持操作 Verbs (*FAIL 等) 我无法测试 P1 和 P2 解决方案。

总结:

总的来说,最可读和最快的解决方案似乎是03与一个简单的负面视图,这也是JavaScript的最快的解决方案,因为JS不支持其他解决方案的更先进的Regex功能。

用此,你避免在每个位置测试一个 lookahead:

/^(?:[^h]+|h++(?!ede))*+$/

相当于(为.net ):

^(?>(?:[^h]+|h+(?!ede))*)$

老答案:

/^(?>[^h]+|h+(?!ede))*$/