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Get to Know re.sub()
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In Python, leveraging regex usually means to use the re module. In your particular case, you’ll use re.sub() to substitute a string with a string based on a regex pattern that is part of your arguments.
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re.sub() takes three positional arguments: pattern, repl, and string. re.sub() also takes two optional arguments: count and flags.
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So, what does re.sub() do? re.sub() returns the string obtained by replacing occurrences of pattern in string by the replacement that you pass in as repl.
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If the pattern isn’t found, string is returned unchanged. The optional argument count defines the maximum number of pattern occurrences to be replaced. If omitted or zero, all occurrences will be replaced.
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The other optional argument, flags, modifies the regex parsing behavior, allowing you to refine your pattern matching even further. Okay, so much for the theory. Let’s put re.sub() into action.
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