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Regular Expressions in Python Exercises

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Questions and Answers

What does the regular expression `m\w\w` represent?

Words or strings with three alphanumeric characters and 'm' as the first character (correct)

Words or strings with two alphanumeric characters

Words or strings with one alphanumeric character

Words or strings with four alphanumeric characters

What is the function of the `compile()` method?

To compile the regular expression into a pattern (correct)

To replace strings

To search for strings

To split strings

What does the `search()` method return if the matching string is not found?

None (correct)

An empty list

An error message

An empty string

What is the purpose of the `group()` method?

To access the matched string Signup and view all the answers

What is the difference between the `match()` and `search()` methods?

<code>match()</code> searches from the beginning, while <code>search()</code> searches the entire string Signup and view all the answers

What does the `findall()` method return if the matching strings are not found?

An empty list Signup and view all the answers

What is the purpose of the `re` module?

To work with regular expressions Signup and view all the answers

What is the function of the regular expression `\w`?

To match any alphanumeric character Signup and view all the answers

What is the purpose of the `Prog=re.compile(r'm\w\w')` line of code?

To compile the regular expression into a pattern Signup and view all the answers

What is the function of the `Result=Prog.search(Str)` line of code?

To search for strings Signup and view all the answers

Study Notes

Regular Expressions

m\w\w matches any three-character string that begins with "m", followed by any two alphanumeric characters.
The compile() method compiles a regular expression pattern into a regular expression object.
The search() method returns None if the matching string is not found.
The group() method returns the matched substring.
The match() method only matches at the beginning of the string, while the search() method searches the entire string.
The findall() method returns an empty list if the matching strings are not found.

`re` Module

The re module provides regular expression operations.

`Prog=re.compile(r'm\w\w')` Line of Code

This line compiles the regular expression pattern m\w\w into a regular expression object named Prog.

`Result=Prog.search(Str)` Line of Code

This line searches for the pattern defined in Prog within the string Str and returns the match object Result.

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Description

Practice exercises on regular expressions in Python, including character descriptions, repetitions, and phone number retrieval. Learn to write regular expressions to find specific patterns in strings.