正则表达式捕获具有精确匹配和部分匹配的子组

Question

我有

input string : 
$data.store.author_handle.name0_handle[*].some.min()
regex :
^\$([a-zA-Z_0-9]+)(.[a-zA-Z_0-9.]+[\[\*0-9\]]*[.a-zA-Z_0-9]*)(.[min\(\)]*$)

所以我得到如下组：

1. 数据
2. .store.author_handle.name0_handle [*]。some.min
3. （）

我想捕捉的地方如下

1. 数据
2. .store.author_handle.name0_handle [*]。一些
3. .min（）

请注意输入可以采用表格

$<literal>.<json path> <aggregator function>
<aggregator function> is optional and can be min/max/avg 
<literal> : ([a-zA-Z_0-9]+)

Json路径是https://github.com/jayway/JsonPath

允许的任何路径

Answer 1

您可以使用以下正则表达式

^\$([\w]+)(\..+?)((?:\.(?:min|max|avg)\(\))?$)

<强> Regex Demo

正则表达式细分

^ #start of string
\$ #Match $ literally

( #Start of 1st capturing group
  [\w]+ #Match characters in set [A-Za-z0-9_] at least once(you can also use [^.]+)
) #End of 1st capturing group

( #Start of 2nd capturing group
  \. #Match . literally
  .+? #Match lazily till next condition is met
) #End of 2nd capturing group

( #Start of 3rd capturing group
  (?: #Non capturing group
    \. #Match . literally
      (?: #Non capturing group
         min|max|avg #Match any from min,max or avg
      )
    \(\) #Match () literally
  )? #As mentioned, this all can be optional(aggregation part)
  $ #End of string(Kept here so that if nothing matches 0 sized string is returned instead of null)
) #End of 3rd capturing group

或

^\$([\w]+)(\..+?)((?:\.(?:(?:\w+)\(\)))?$)

用于广义聚合函数

<强> Ideone Demo