Python One

match and search:

match starts at pos 0 to find if there is any occurence of the pattern

search starts at any point

replace matched string with new string:

regex = re.compile(r'\w+(?=foo)')

newstr,number =  re.subn(regex,'bar','dddfoo eeefoo')

#newsrtr dddbar,eeebar

#number = 2

// With

With is like try(...) {} catch {} in Java, the managed resource will close automatically.