def pyfunc():
    return 'pyfunc'
Compare to the re pattern. 
dataset/ETHPy150Open ipython/ipython-py3k/IPython/testing/plugin/simple.py/pyfunc--crossover with--dataset/ETHPy150Open petrvanblokland/Xierpa3/xierpa3/toolbox/parsers/validator.py/Validator.isPattern