Test: Patterns - 2 - EmSAT Achieve MCQ

Patterns in Python refer to regular expressions that allow us to match and manipulate specific patterns of text or data.

Regular expressions in Python are primarily used to search for and match specific patterns within strings.

The "re" module in Python provides support for regular expression operations.

The dot character (".") in a regular expression pattern represents any single character.

The "^" character in a regular expression pattern is used to match the beginning of a line.

The regular expression pattern "co[a-z]+e" will match any substring starting with "co", followed by one or more lowercase letters, and ending with "e".

The regular expression pattern "\b\d{3}-\d{3}-\d{4}\b" will match a phone number in the format "XXX-XXX-XXXX". The search() function returns the first occurrence that matches the pattern.

The regular expression pattern "\b[A-Z][a-z]+\b" will match words starting with an uppercase letter followed by one or more lowercase letters. The findall() function returns all matches in the text.

The regular expression pattern "\b([a-z]+) \1\b" uses a capturing group to match a word followed by a space and the same word again. The findall() function returns all matches in the text.

The split() function splits the text based on the regular expression pattern "\d+", which matches one or more digits. The resulting list contains the substrings between the digits.

The pattern "r"\w+@\w+.\w+"" matches an email address in the format "username@domain.extension" where "username", "domain", and "extension" consist of one or more word characters.

The regular expression pattern "\b[A-Za-z]+\b" matches words in the given text. The findall() function returns a list of all matched words, and len(result) gives the count of matched words.

The pattern "r"^https://\w+.\w+.\w+$"" matches a URL starting with "https://" followed by a domain and extension. The caret (^) matches the start of the string, and the dollar sign ($) matches the end of the string.

The regular expression pattern "\d{2}-\d{2}-\d{4}" matches two digits, followed by a hyphen, followed by two digits, another hyphen, and four digits. The findall() function returns a list of all matched patterns in the text.

The sub() function replaces all matches of the pattern "\b[A-Z][a-z]+\b" with the string "animal".