I was just writing a program where I wanted to insert a newline after a specific pattern. The idea was to match the pattern and replace with the overall match (i.e. capture group \0) and \n. s = "abc" insert_newline_pattern = re.compile(r"b") re.sub(insert_newline_pattern, r"\0\n", s) However the output is a\x00\nc, reading \0 as a null character. I know that I can "simply" rewrite this as: s = "abc" insert_newline_pattern = re.compile(r"(b)") re.sub(insert_newline_pattern, r"\1\n", s) which outputs the desired ab\nc with the idea of wrapping the overall match into group \1 and substituting this. See also a Python regex101 demo. Is there a way to access the overall match in any way, similar to this PCRE regex101 demo in Python? Continue reading...
