Searching for pattern in variable using case statements Post: 302977953

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Top Forums Shell Programming and Scripting Searching for pattern in variable using case statements Post 302977953 by drl on Sunday 24th of July 2016 01:25:12 PM

07-24-2016

Registered User

Hi.

It would probably be useful if you were to tell us which items the different platforms had in common: bash, ksh, zsh, awk, perl, grep, etc.

Here's a solution using an array, loop, and case:

Code:

#!/usr/bin/env bash

# @(#) s1       Demonstrate shell array with case selector.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { : ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
C=$HOME/bin/context && [ -f $C ] && $C

v1="gine is very bad
vine is pretty good"

pl " Input data variable, piped into cat:"
echo "$v1" | cat -n

pl " Input data array with printf:"
declare -a a1="$v1"
printf "%s\n" "${a1[*]}"

pl " Looking through each element in the array:"
IFS=$'\n'
for line in ${a1[*]}
do
  db " Working on line [$line]"
  case $line in
  (*vine*)      echo " HIT! Found vine." ;;
  esac
done

exit 0

producing:

Code:

$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.4 (jessie) 
bash GNU bash 4.3.30

-----
 Input data variable, piped into cat:
     1  gine is very bad
     2  vine is pretty good

-----
 Input data array with printf:
gine is very bad
vine is pretty good

-----
 Looking through each element in the array:
 db,  Working on line [gine is very bad]
 db,  Working on line [vine is pretty good]
 HIT! Found vine.

See man bash, etc. for details.

Best wishes ... cheers, drl

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LEARN ABOUT SUSE

tcl_stringcasematch

Tcl_StringMatch(3)					      Tcl Library Procedures						Tcl_StringMatch(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_StringMatch, Tcl_StringCaseMatch - test whether a string matches a pattern

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_StringMatch(str, pattern)

       int
       Tcl_StringCaseMatch(str, pattern, flags)

ARGUMENTS

       const char *str (in)		 String to test.

       const char *pattern (in) 	 Pattern to match against string.  May contain special characters from the set *?[].

       int flags (in)			 OR-ed combination of match flags, currently only TCL_MATCH_NOCASE.  0 specifies a case-sensitive search.
_________________________________________________________________

DESCRIPTION

       This  utility  procedure  determines  whether  a  string  matches  a given pattern.  If it does, then Tcl_StringMatch returns 1.  Otherwise
       Tcl_StringMatch returns 0.  The algorithm used for matching is the same algorithm used in the string match Tcl command and  is  similar	to
       the algorithm used by the C-shell for file name matching;  see the Tcl manual entry for details.

       In  Tcl_StringCaseMatch,  the algorithm is the same, but you have the option to make the matching case-insensitive.  If you choose this (by
       passing TCL_MATCH_NOCASE), then the string and pattern are essentially matched in the lower case.

KEYWORDS

       match, pattern, string

Tcl									8.5							Tcl_StringMatch(3)

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