regex - 在一个句子中匹配括号内的单词的正则表达式

Question

我需要一个正则表达式来匹配一个句子中括号内的单词。例如：

"this is [stack]overflow. I [[love]this[website]]."

我想从上面的句子中匹配的是单词 stack、love 和 website。

我已经尝试了以下正则表达式\[(.*[^\]\[])\]，但它不起作用。

Answer 1

以下应该有效：

\[([^\[\]]*)\]

示例：http ://www.rubular.com/r/uJ0sOtdcgF

解释：

\[           # match a literal '['
(            # start a capturing group
  [^\[\]]*     # match any number of characters that are not '[' or ']'
)            # end of capturing group
\]           # match a literal ']'

Answer 2

Try doing this in a shell :

$ echo 'this is [stack]overflow. I [[love]this[website]]' |
    grep -oP '\[+\K[^\]]+'
stack
love
website

This works with PCRE & perl engines.

EXPLANATIONS

\[           # match a literal '['
+            # one (preceding character) or more
\K           # "reset" the regex to null
[^]          # excluding class, here a literal \]
\]           # match a literal ']'

explanations about \K trick