Lecture 11b - Regular Expressions - University of Washington
Lecture 11b - Regular Expressions
Thanks to Mary Kuhner for many slides
1
Using objects and classes
? A class is a variable type with associated functions ? An object is an instance of a class ? We have already used the string class ? String offers functions such as upper(), lower(), and find() ? In this lecture we'll use classes; Thursday we'll create some
2
Using an object
mystring = "ATCCGCG" print mystring.find("C") 2 # position of first "C" print mystring.count("C") 3
3
Regular Expressions
? Regular expressions (regexp) are a text-matching tool embedded in Python
? They are useful in creating string searches and string modifications ? You can always use regular Python instead, but regexps are often much
easier ? Documentation:
4
Motivating example
5
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