import re
# Compile a regular expression pattern into a regular expression object, which can be used for matching using its match(), search() and other methods, described below.
prog = re.compile(pattern)
result = prog.match(string)
# is equivalent to
result = re.match(pattern, string)import re
>>> m = re.search('(?<=abc)def', 'abcdef')
>>> m.group(0)
'def're module is used for regex operations. to import, type `import re`. Also, no need to install it since it's built-in in Python.>>> m = re.search(r'(?<=-)\w+', 'spam-egg')
>>> m.group(0)
'egg'
>>> pattern = re.compile("o")
>>> pattern.match("dog") # No match as "o" is not at the start of "dog".
>>> pattern.match("dog", 1) # Match as "o" is the 2nd character of "dog".
<re.Match object; span=(1, 2), match='o'>