grep info page

[wolfgang zeikat]

hi,

in the
        * Regular Expressions::
section of the info page for grep i found:
        The symbol `\w' is a synonym for `[[:alnum:]]' and `\W' is a
synonym for `[^[:alnum]]'.

the definition of [:alnum] does not contain the understroke _ tho.
nevertheless, grep '\w' also finds the understroke:
address@hidden /root]# echo blah_ | grep '\w'
blah_

best regards,

wolfgang