Скачать или смотреть Python Programming: Lesson 42 - Intro to Metacharacters

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In the previous lesson (   • Python Programming: Lesson 41 - Basic Regu...  ), we introduced the concept of regular expressions. Here, we review the fundamentals and build on our understanding to discuss metacharacters. Because there is a lot to say about this topic, it will be continued in the next lesson.

a , b = b , a switches the values of two variables (tuple unpacking, as will be discussed more general in an upcoming video)

print( x , y , z ) prints x, y , and z on the same line, each separated by a space

Remember that methods can also be defined as strongly or weakly private, in addition to variables.

Recall that regular expressions allow us to use the match and search functions from the re module. These functions accept a pattern r"string" and wordToCheck "regularString". re.match evaluates if the wordToCheck begins with the pattern, and re.search evaluates if wordToCheck somewhere contains pattern.

re.sub(a,b,c) replaces the regular expression a with string b in the overall string c

Metacharacters:
. matches ANY character
^ matches the beginning of a string
$ matches the end of a string

1:33 Review of Switching two Variables: x, y = y, x
3:49 Review of Printing Multiple Arguments with print( x, y, ... )
6:17 Review of Private Fields in Python
7:40 Review of Regular Expressions
13:09 NEW: Metacharacters

Ready for groups in regular expressions? Check out the next video when you're ready:    • Python Programming: Lesson 43 - Groups in ...  

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