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regex

20160927

Here is Dr. Chuck's RegEx "cheat sheet". You can also download it here:

www.dr-chuck.net/pythonlearn/lectures/Py4Inf-11-Regex-Guide.doc

Here's Dr. Chucks book on learning python: www.pythonlearn.com/html-270

For more information about using regular expressions in Python, see docs.python.org/2/howto/regex.html

regex

20160628

Regex: positive lookbehind assertion

(?<=...)

Matches if the current position in the string is preceded by a match for ... that ends at the current position.

eg.

s="Yes, taters is a synonym for potaters or potatoes."

re.sub('(?<=po)taters','TATERS', s)

'Yes, taters is a synonym for poTATERS or potatoes.'

Or example from python doc:

m = re.search('(?<=abc)def', 'abcdef')
m.group(0)
'def'

Notes by Willem Moors. Generated on momo:/home/willem/sync/20151223_datamungingninja/pythonbook at 2019-07-31 19:22