[Perl-beginners] Perl Regex with unix grep command

# You have to get the backslash past the shell

grep -P 'makan\$' file.txt

# or

grep -P makan\\$ file.txt

Hi all,

On Sat, 03 Sep 2011 17:15:51 -0400
Shawn H Corey wrote:
Just to be a bit more pedantic, in this case:

grep -P makan\\\$ file.txt

would be safer and more idiomatic, because otherwise the shell would treat the
string as a literal backslash followed by the opening of a shell variable,
which all start with "$".

Regards,

Shlomi Fish

JF> According to the grep manual page I can use the -P option to use
JF> Perl regular expressions as follows:

JF> grep -P PERL_REGEX INPUT_FILE

just to let you know, nothing but perl can run perl regexes. all the
ones that claim it are doing subsets and in some cases not even close
anymore.

JF> however, I cannot get the following pattern to match a literal
JF> dollar sign:

JF> grep -P makan\$ file.txt

you are escaping that from the shell but the 'perl' regex will then make
it match the end of a line or before a newline. you need to quote it
against the shell with '' and keep the \ in there.

uri