python - Regex to split a sentence into simple English words -

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i have sentence , wish extract words it. define word [a-za-z] word may contain apostrophe. apostrophe on own not word. programming python3.

input text: 

don't-thread 0 '' ' 'on \r\nme!

should give:

don't thread on  me

with regard regex splitting. translate follows using python:

don't -> dont  thread -> thread on -> on me -> me

more input:

   ''kay', said. 'what're goin' do?'

regex split , python translation should give:

   ''kay' -> kay     ->    said -> said    'what're -> whatre    ->    goin' -> going    ->    ->

here's use:

\b(\s+)\b

which matches lot more i'm interested in.

update:

words can begin apostrophe. such "get 'em!"

you can try regex:

[a-za-z]+(?:'[a-za-z]+)*

which should work on regex engines. of groups can shortened depending on specifics of regex engine, that's more general regex.

makes sure apostrophe surrounded letters.

edit: allow initial apostrophes, can add '? @ beginning:

'?[a-za-z]+(?:'[a-za-z]+)*

regex101 demo


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