>EGexecute should return a match, though,>right? The pattern '\a' matches
>the data 'a'. So the bug is in EGexecute >somewhere, not in its caller.
Thanks for the reply. In my opinion the bug is not in the EGexecute, since it uses re_search (from gnulib) and the re_search is not returning a match. So there is no problem in EGexecute. I also compared python re.search with \a also don't return a match and I found \a can be interpreted a bell or alarm.
It's good to mention that the lack of match happens for all lowercase characters that are not defined in regex (for example echo "j" | grep -i --color '\j'. Comparing to python, they don't allow us to escape any incorrect lowercase characters, for example:
>>>re.search("\j","j", re.IGNORECASE)
re.error: bad escape \j at position 0
Due to that I think grep should also ignore the non-maching/bad character instead of printing them.
Best regards,
Tomasz Dziendzielski