匹配句子中的特定点

Question

I want to add spaces where needed (after . ) in sentences. When a . is not followed by another . or a space, a space should be added.

I've came up with that regex :

\.(?![ \.])

There is only one problem, if the . is at the end of the string, it should not be selected.

Example :

Here is a test sentence...Here is another sentence.

Should select : Here is a test sentence.. . Here is another sentence.

but my solution select :

Here is a test sentence.. . Here is another sentence .

After the regex, all groups will be replaced by ". ". This part is already done and working.

Answer 1

ShellFish使我步入正轨，提出了这个有效的正则表达式：

\.(?![\.\s])

Answer 2

另一种选择是使用正向先行

\.(?=\w)

Answer 3

modify your pattern to

\.(?![. ]|$)  

Demo

\.              # "."
(?!             # Negative Look-Ahead
  [. ]          # Character Class [. ]
  |             # OR
  $             # End of string/line
)               # End of # Negative Look-Ahead