找到并用正确的句子替换以小写字母开头的句子。 正则表达式或崇高

Question

I have text where some sentences start with lowercase. i need to find them and replace with correct sentence case.some punctuations are incorrect. ie sentence starting after full stop without space.

ie

.this sentence
and this.also this. and this.This one is not.

replace with ->

.This sentence
And this.Also this. And this.This one is not.

sublime text 3 solution, regex , or python nltk solution is suitable.

i tried this solution. but it is slow and does not find sentences without space after full stop.

import nltk.data
from nltk.tokenize import sent_tokenize
text = """kjdshkjhf. this sentence
and this.also this. and this. This one is not."""

aa=sent_tokenize(text)
for a in aa:
    if (a[0].islower()):
        print a
        print "****"

Answer 1

You can use this pattern

^([^a-zA-Z]*)([a-z])

and use $1\\U$2 as substitution

Regex Demo

Update:- If you want to capture first lowercase after each . ( period ) you can use this

^([^a-zA-Z]*)([a-z])|(\.\s*)([a-z])

Demo