camelCase2hyphen-case.py

# credit https://dev.to/rrampage/snake-case-to-camel-case-and-back-using-regular-expressions-and-python-m9j

import re

REG = r"(.+?)([A-Z])"

def snake(match):
    return match.group(1).lower() + "-" + match.group(2).lower()

words = """MyClass
MyClassFactory
MyClassFactoryBuilder
MyClassFactoryBuilderImpl
myInstance
myInstance2
abc
patternMatcher
Hello""".splitlines()

results = [re.sub(REG, snake, w.strip(), 0).lower() for w in words]
[print(w) for w in results]