extracting temperature degrees (celcius or fahrenheit) from string

Question

I am using (char.*?char2) in order to extract subparts which starts with char1 and which ends with char2 from a string.

Now I

Answer 1

(\d+) ?°([CF])

The first group should have the temperature, the second C or F.

Expanding it to allow for a bit more variation:

([+-]?\d+(\.\d+)*)\s?°([CcFf])

This would match any of these inputs, allowing for more than one space, or tab, lower case unit, decimal points and signs.

Example python program:

import re
string = '''
20°C
2 °F
It was cold, 2 °F in fact.
30 °C
-40 °C
+2.3^I°c
+2.3°c
10°C
'''
pattern = r'([+-]?\d+(\.\d+)*)\s?°([CcFf])'
print(re.findall(pattern, string))
# Output:
# [('20', '', 'C'), ('2', '', 'F'), ('2', '', 'F'), ('30', '', 'C'),
# ('-40', '', 'C'), ('+2.3', '.3', 'c'), ('+2.3', '.3', 'c'),
# ('10', '', 'C')]