Python Regex: Extract all occurences of a substring within a string

Question

I am trying to extract all occurrences of a substring within a string using Python Regex. This is what I have tried:

import re
line = "The dimensions of the first rectangle: 10'x20', second rectangle: 10x35cm, third rectangle: 30x35cm"
m = re.findall(r'd+x.*?[a-zA-Z]', line)
print (m)

The output I am getting is ['10x35c', '30x35c']

The output I am trying to achieve is ['10'x20'', '10x35cm', '30x35cm']

Answer 1

You may use this regex:

r"d+['"]?xd+['"]?(?:s*[a-zA-Z]+)?"

RegEx Demo

Code:

>>> import re
>>> line = "The dimensions of the first rectangle: 10'x20', second rectangle: 10x35cm, third rectangle: 30x35cm"
>>> print (re.findall(r"d+['"]?xd+['"]?(?:s*[a-zA-Z]+)?", line))
["10'x20'", '10x35cm', '30x35cm']

RegEx Details:

• d+: Match 1+ digits
• ['"]?: Match optional ' or "
• x: Match letter x
• d+: Match 1+ digits
• ['"]?: Match optional ' or "
• (?:s*[a-zA-Z]+)?: Match optional units comprising 1+ letters