regex - regular expression for cpp_source files and c_source

can tell me how express regular expression following 2 strings:

c_source_files cpp_source_files

i analyze text file contains text segments beginning mentioned strings.

it expressed approximately follows:

for result in re.findall('c(.*?)pp_source_files', re.s)   # something....

thx in advance!

you can use regex:

# 'c' optionally followed 'pp', followed '_source_files' r'c(pp)?_source_files'

if need these strings separate words (so things notc_source_files don't match), can use word boundary 'matchers':

# \b matches word boundary r'\bc(pp)?_source_files\b'

EIght