How can I extract a words with separate letters from a text?

I have some ill-structured files like this:

file1:  o n l i n e   U N I V E R S I T Y Obtain Diploma.

file2: Howdy There C E R T I F I E D U N I V E R S I T Y D I P L O M A S and d e g r e sWouldn't it be great to get a Masters degree.

I would like to extract just the words with spaces in this case I will get:

f1: 'o n l i n e'     'U N I V E R S I T Y'

f2:'C E R T I F I E D U N I V E R S I T Y D I P L O M A S'   'd e g r e s'

I tried with regular expressions but it didn't work for me.

thanks for any help

[Image Analyst]

For f2, why is the final "s" to be extracted as part of 'd e g r e s', and not considered as part of sWouldn't? I would think that it should not be included because it's attached to sWouldn't which is a word without spaces and thus, not to be extracted. Please clarify.

[Nadjate]

because if I want to preprocess the text with the correct english words it will be like:

f2: Howdy There certified university diplomas and degrees Wouldn't it be great to get a Masters degree.

so the letter s belong to the word 'd e g r e s' and not considered as part of 'sWouldn't'

thanks for your comment

Answer 1

[Azzi Abdelmalek]

file1=' o n l i n e   U N I V E R S I T Y Obtain Diploma.'
f1=regexp(file1,'(?<=\s)(\w\s)+','match')
f1(cellfun(@numel,f1)==2)=[]

[Nadjate]

your answer is working for the first file. thank you.

but any suggestion for the second file??????

[Azzi Abdelmalek]

This also works

file1=' Howdy There C E R T I F I E D U N I V E R S I T Y D I P L O M A S and d e g r e sWouldn''t it be great to get a Masters degree.'
f1=regexp(file1,'(?<=\s)(\w\s)+','match');
f1(cellfun(@numel,f1)==2)=[];
celldisp(f1)