How to pick out a particular group of numbers in a string-CodePudding

I have a string (which is different everytime but follows a similar format):

54321.0 67778.0000002 0.3673987009 1 1017.750 88.370 512 7 1 H8711-3040

I'm trying to use regular expressions to be able to pick out any one of those entries in my python code, but I'm struggling.

I'm trying

testRegex = re.compile(r'\w. \w')
out = testRegex.search('# 53421.0 67778.0000002 0.3673987009 1 1517.750 88.370 512 7 1 J1745-3040')
print(out.group())

But I'm just getting the whole line returned. I can see why it does that but not sure how to just pick out "512" for example (whatever number might be in its place).

CodePudding user response：

You can use

re.findall(r'\b\w(?:\S*\w)?\b', s)

See the regex demo. Details:

\b - a word boundary
\w - a word char
?:\S*\w)? - an optional sequence of any zero or more non-whitespace chars and then a word char
\b - a word boundary

See the Python demo:

import re
s = '# 53421.0 67778.0000002 0.3673987009 1 1517.750 88.370 512 7 1 J1745-3040'
print( re.findall(r'\b\w(?:\S*\w)?\b', s) )
# => ['53421.0', '67778.0000002', '0.3673987009', '1', '1517.750', '88.370', '512', '7', '1', 'J1745-3040']