> % echo foo.c | 9 grep '*\.c'
correct. match \.c as a literal string. there is no match.
> % echo foo.c | 9 grep '*.c'
> foo.c
correct. match .c as a littal string. there is a match.
> % echo fooxc | 9 grep '*.c'
> %
> % echo fooxc | 9 grep '.*.c'
> fooxc
correct. match 0-n any character then 1 any character then a c. there is a
match.
> % echo fooxc | 9 grep '.*\.c'
correct. this time there's no match because '.' is treated as a literal not
a pattern.
> % echo foo.c | 9 grep '.*\.c'
> foo.c
correct. match 0-n any characters, then a literal '.' then literal 'c'. there
is a match.
> % echo foo.c | 9 grep '*foo.c'
> foo.c
correct. match the literal string foo.c. there is a match.
remember that the match doesn't have to be anchored by default, so i sometimes
do this
grep $somesym `{find /sys/src|grep '\.[chys]$'}
this is also packaged up in the local version of 'g'; this would be equivalent
g $somesym /sys/src
- erik
