https://www.tutorialspoint.com/python/python_reg_expressions.htm
Matching Versus Searching
Python offers two different primitive operations based on regular expressions: match checks for a match only at the beginning of the string, while search checks for a match anywhere in the string (this is what Perl does by default).
import re
line = "Cats are smarter than dogs";
matchObj = re.match( r'dogs', line, re.M|re.I)
if matchObj:
print("match --> matchObj.group() : ", matchObj.group())
else:
print("No match!!")
searchObj = re.search( r'dogs', line, re.M|re.I)
if searchObj:
print("search --> searchObj.group() : ", searchObj.group())
else:
print("Nothing found!!")
console:
No match!!
search --> searchObj.group() : dogs
Search and Replace
One of the most important re methods that use regular expressions is sub.
re.sub(pattern, repl, string, max=0)
