Best way to strip punctuation from a string in Python
http://stackoverflow.com/questions/12437667/how-to-replace-punctuation-in-a-string-python
>import string
>import re
>
>regex = re.compile(‘[%s]’ % re.escape(string.punctuation))
>
>out = regex.sub(‘ ‘, “This is, fortunately. A Test! string”)
>
>’This is fortunately A Test string’
How can I check if a string contains ANY letters from the alphabet?
http://stackoverflow.com/questions/9072844/how-can-i-check-if-a-string-contains-any-letters-from-the-alphabet
any(c.isalpha() for c in string_1)
A regular expression for extracting the URL from a line of HTML
from:
Using Python to Access Web Data
Coursera, Oct 26 — Dec 14, 2015.
https://www.coursera.org/learn/python-network-data/lecture/UxIOc/lets-write-a-web-browser
cf. URL extraction with bs4
https://franzcalvo.wordpress.com/2015/11/15/beautiful-soup
The Double Split Pattern
from:
Using Python to Access Web Data
Coursera, Oct 26 — Dec 14, 2015.
https://www.coursera.org/learn/python-network-data
fileinmem = open(“Histology_Ch02_01.txt”)
for line in fileinmem:
____print(line)
____for i in line.split():
________print(i)
Using re.search() like find()
from:
Using Python to Access Web Data
Coursera, Oct 26 — Dec 14, 2015.
https://www.coursera.org/learn/python-network-data
The Python Standard Library > 6. Text Processing Services > re
https://docs.python.org/3.4/library/re.html
Regular expressions HOWTO:
https://docs.python.org/3.4/howto/regex.html
For … science underlying regular expressions (deterministic and non-deterministic finite automata), you can refer to almost any textbook on writing compilers.
Metacharacters are not active inside classes: … '$' is usually a metacharacter, but inside a character class it’s stripped of its special nature.
Perhaps the most important metacharacter is the backslash, \.
Some of the special sequences beginning with '\' represent predefined sets of characters
* doesn’t match the literal character *; instead, it specifies that the previous character can be matched zero or more times, instead of exactly once.
Pay careful attention to the difference between * and +;
match() versus search()
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Regular expressions
http://www.pythonlearn.com/html-008/cfbook012.html
Python Regular Expressions
2012
https://developers.google.com/edu/python/regular-expressions
Christopher Potts emoticons
https://class.coursera.org/nlp/lecture/145
Python: Regular expressions
University of Cambridge
http://www.ucs.cam.ac.uk/docs/course-notes/unix-courses/archived/archived-python-courses/PythonRE/files/PythonRE.pdf
regular123
