refer to python re search code example
Example 1: python re compile
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)
Example 2: regex in python
>>> import re
>>> p = re.compile('ab*')
>>> p
re.compile('ab*')