在多个括号中匹配特定的括号

时间:2021-09-16 23:37:12

Take the String:
"The only true (wisdom) is in knowing you know (nothing)"
I want to extract nothing.

拿绳子来说:“唯一的真理(智慧)就是知道自己什么都不知道。”我什么也不想提取。

What I know about it:

我所知道的:

  • It will always be inside a parenthesis
  • 它总是在括号里面
  • The parenthesis will always be the last element before the line-end: $
  • 括号始终是行尾:$之前的最后一个元素

I first attempted to match it with /\(.*\)$/, but that obviously returned
(wisdom) is in knowing you know (nothing).

我第一次尝试将它与/\(.*\)$/匹配,但显然回报(智慧)是知道你什么都不知道。

6 个解决方案

#1


4  

You want to use negative character group matching, like [^...]:

你想使用消极的角色组匹配,就像[^…]:

s = 'The only true (wisdom) is in knowing you know (nothing)'
s.match(/\(([^)]+)\)$/).captures

在多个括号中匹配特定的括号

Debuggex Demo

Debuggex演示

In this case, nothing is in the first sub-group match, but the entire regex technically matches (nothing). To match exactly nothing as the entire match, use:

在这种情况下,第一个子组匹配中没有任何内容,但是整个regex技术上是匹配的(没有)。若要与整个匹配完全不匹配,请使用:

s = 'The only true (wisdom) is in knowing you know (nothing)'
s.match(/(?<=\()([^)]+)(?=\)$)/).captures

在多个括号中匹配特定的括号

Debuggex Demo

Debuggex演示

#2


1  

I would do

我要做

s = 'The only true (wisdom) is in knowing you know (nothing)'
s.match(/\(([^)]+)\)$/).captures # => ["nothing"]

#3


0  

You could use scan to find all matches and then take the last one:

你可以用扫描找到所有的匹配,然后取最后一个:

str = "The only true (wisdom) is in knowing you know (nothing)"
str.scan(/\((.+?)\)/).last
#=> "nothing"

#4


0  

You can use the \z which matches end of string. try

您可以使用\z来匹配字符串的结束。试一试

\([a-z]+\)\z

\[a - z]+ \ \ z

Way simpler and will ignore everything else but what you need.

更简单,会忽略其他一切,除了你需要的。

Test it here:

测试在这里:

http://rubular.com/

http://rubular.com/

#5


0  

It's even trickier if there's any chance of nesting. In that case you need some recursion:

如果有任何嵌套的机会,那就更麻烦了。在这种情况下,你需要一些递归:

"...knowing you know ((almost) nothing)"[/\(((?:[^()]*|\(\g<1>\))*)\)$/, 1]
#=> "(almost) nothing"

#6


0  

Look ma, no regex!

看哪,没有正则表达式!

s = 'The only true (wisdom) is in knowing you know (nothing)'

r = s.reverse
r[(r.index(')') + 1)...(r.index('('))].reverse
  #=> "nothing"

#1


4  

You want to use negative character group matching, like [^...]:

你想使用消极的角色组匹配,就像[^…]:

s = 'The only true (wisdom) is in knowing you know (nothing)'
s.match(/\(([^)]+)\)$/).captures

在多个括号中匹配特定的括号

Debuggex Demo

Debuggex演示

In this case, nothing is in the first sub-group match, but the entire regex technically matches (nothing). To match exactly nothing as the entire match, use:

在这种情况下,第一个子组匹配中没有任何内容,但是整个regex技术上是匹配的(没有)。若要与整个匹配完全不匹配,请使用:

s = 'The only true (wisdom) is in knowing you know (nothing)'
s.match(/(?<=\()([^)]+)(?=\)$)/).captures

在多个括号中匹配特定的括号

Debuggex Demo

Debuggex演示

#2


1  

I would do

我要做

s = 'The only true (wisdom) is in knowing you know (nothing)'
s.match(/\(([^)]+)\)$/).captures # => ["nothing"]

#3


0  

You could use scan to find all matches and then take the last one:

你可以用扫描找到所有的匹配,然后取最后一个:

str = "The only true (wisdom) is in knowing you know (nothing)"
str.scan(/\((.+?)\)/).last
#=> "nothing"

#4


0  

You can use the \z which matches end of string. try

您可以使用\z来匹配字符串的结束。试一试

\([a-z]+\)\z

\[a - z]+ \ \ z

Way simpler and will ignore everything else but what you need.

更简单,会忽略其他一切,除了你需要的。

Test it here:

测试在这里:

http://rubular.com/

http://rubular.com/

#5


0  

It's even trickier if there's any chance of nesting. In that case you need some recursion:

如果有任何嵌套的机会,那就更麻烦了。在这种情况下,你需要一些递归:

"...knowing you know ((almost) nothing)"[/\(((?:[^()]*|\(\g<1>\))*)\)$/, 1]
#=> "(almost) nothing"

#6


0  

Look ma, no regex!

看哪,没有正则表达式!

s = 'The only true (wisdom) is in knowing you know (nothing)'

r = s.reverse
r[(r.index(')') + 1)...(r.index('('))].reverse
  #=> "nothing"