Getting started with regex in python

I have been wanting to learn regex. Not just because it reminds me of q a bit but because it’s actually very useful and can be used within numerous languages including python. In case you don’t know, regex stands for regular expression. A regex is “a sequence of characters that define a search pattern.” Most popular use case is to search strings for a pattern.

I was looking at videos from this year’s PyCon and stumbled up on a video of Trey Hunner conducting regex workshop at PyCon 2016. If you are looking to learn regex, I encourage you to watch the video. You can also find most of the stuff mentioned in the video on this website.

After I watched the video, I did some practice on my own which I wanted to share here.

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# Import the regex module
import re 

# Define our sentence
sentence = "I am a 26 years old software developer and I used to work on Wall Street (10005)."

re.search(r'\d', sentence).group()

'2'

re.search(r'\D', sentence).group()

'I'

re.search(r'years', sentence).group()

'years'

re.search(r'heart', sentence)  # Doesn't return anything since our sentence doesn't have 'heart'

re.search(r'\w', sentence).group()

'I'

re.search(r'\w{3,}', sentence).group()

'years'

re.search(r'\w{,3}', sentence).group()

'I'

re.search(r'\d{5}', sentence).group()  # Get 5 consecutive digits

'10005'

re.search(r'wall', sentence) # doesn't return anything, need to ignore case

re.search(r'wall', sentence, re.IGNORECASE).group()

'Wall'

re.split(r'and', sentence)

['I am a 26 years old software developer ',
 ' I used to work on Wall Street (10005).']