On Thu, Nov 9, 2023, 8:36 PM Steffen Nurpmeso <[email protected]> wrote:
> alex xmb sw ratchev wrote in
> <caalkere1uq1xmxw_8zdij2ggz-gxb9s9pa5f43vyonvktmr...@mail.gmail.com>:
> ...
> |> So i did that (what a mess -- does anyone know how i can create an
> |> awk regular expression where parts of the expression is a variable
> |> that should be expanded? ugh! what do i know??):
> |
> |awk -v var1='cont ent' -vv2="$other' ' { code } '
> |
> |keep in mind that mass spawning of any bin is , when its done massley ,
> |very out ..
>
> i fail to see what this has to do with my problem.
>
> |also var so awk processes some \esc caracters
> |to cleanly insert data , either use gawk ENVIRON["varname']
> |or via alternative fd or as part of file parse things
>
> |my='a b c'
> |# one line string
> |awk 3<<<"$my thing' BEGIN { f = "/dev/fd/3" ; getline v <f ; close( f ) }
> |other main code here '
>
> i am still wondering.
>
> |foo=content
> |export foo
> |or foo=$foo gawk ..
> |gawk -vv=foo ' BEGIN { v = ENVIRON[ v ] } other code '
> |same as v = ENVIRON[ "v" ] or "varname"
>
> wow.
>
> |to match in string , thers two ways , one is exact text match , the other
> |is regex
> |
> |if u /foo/ thats a regex
>
> really?
>
> |$0 ~ "foo"
> |
> |tx=" my text "
> |if ( $0 ~ "pre" tx "stu" ) { ye }
>
> this does not work the way you think maybe?
> I surely was there myself.
>
> |thers additional stuff to say containing substr() and match() , and some
>
> even with match() not (in a global match line).
>
> |others
> |
> |#exact
> |etx = " exact "
> |if ( index( $0 , etx ) ) { ye }
> |if ( index( $0 , "pre" etx "stu" ) ) { ye }
>
> i am really impressed.
> But that did not work out.
>
can u detail ur case some
i suggest using index
if u match or ~ u regex
means ur input s gotta get regex char escaped
unless u have a very special reason , use index
and not care about awk var \esc seq expandment
at least when have simple strings
eg
m=bar txt=' foo
bar
bla '
awk -vm="$m" ' index( $0 , m ) '
should return the bar line
' bar ' would also match
' bar ' of course not
--steffen
> |
> |Der Kragenbaer, The moon bear,
> |der holt sich munter he cheerfully and one by one
> |einen nach dem anderen runter wa.ks himself off
> |(By Robert Gernhardt)
>
