By Víctor Romero, Félix López
ISBN-10: 1783283157
ISBN-13: 9781783283156
A brief and directly to the purpose advisor that explains the implementation of normal Expressions in Python.This booklet is aimed toward Python builders who are looking to how one can leverage typical Expressions in Python. easy wisdom of Python is needed for a greater knowing.
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Additional info for Mastering Python Regular Expressions
Example text
Quantifier. findall("aba") ['a', '', 'a', ''] Basically, both of them match the expression even though the preceding regex is not found: a a* Match a b a* Match ‘’ a a* Match a $ a* Match ‘’ findall matching process First, the regex matches the character a, then it follows with b. There is a match due to the * quantifier, the empty string. After that, it matches another a and finally it tries to match $. As we've mentioned before, even though you can't see $, it's a valid character for the regex engine.
If it's invoked with no arguments or zero, it will return the entire match; while if one or more group identifiers are passed, the corresponding groups' matches will be returned. search("Hello⇢world") The pattern matches the whole string and captures two groups, Hello and world. Once we have the match, we can see the the following concrete cases: • With no arguments or zero, it returns the entire match. group(0) 'Hello⇢world' • With group1 bigger than 0, it returns the corresponding group. group(2) 'world' • If the group doesn't exist, an IndexError will be thrown.
In the next chapter, we are going to jump over to Python to start practicing with the re module. [ 23 ] Regular Expressions with Python In the previous chapter, we've seen how generic regular expressions work. In this chapter, we walk you through all the operations Python provides us with to work with regular expressions and how Python deals with them. To do so, we will see the quirks of the language when dealing with regular expressions, the different types of strings, the API it offers through the RegexObject and MatchObject classes, every operation that we can do with them in depth with many examples, as well as some problems generally faced by users.