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Top Forums Shell Programming and Scripting extract a string within a string using a pattern Post 302469174 by adshocker on Thursday 4th of November 2010 11:24:01 PM
Old 11-05-2010
Quote:
Originally Posted by Chubler_XL
You didn't mention what shell. If you use the external sed command this should work for most:
Code:
SOURCE=`echo $file | sed "s/^AR_//;s/_.*//"`

thanks. how can i get the shell ? i'm using Linux.

Code:
[ ~]$ uname
Linux

how can i do this in sed even if prefix is other than AR? i tried the following but doesnt work.
Code:
[ ~]$ source=`echo $file | sed "s/^*_//;s/_.*//"`
[ ~]$ echo $source
AR
[ ~]$ source=`echo $file | sed "s/*_//;s/_.*//"`
[ ~]$ echo $source
AR

Quote:
Originally Posted by Chubler_XL
For bash/ksh
Code:
SOURCE=${file#AR_}
SOURCE=${SOURCE%%_*}

thanks.. actually the prefix can be other than AR. so i tried
Code:
file=AR_LEGACY_20101104_105500.txt
source=${file#*_}
source=${source%%_*}
echo $source

seems to work.
 

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MatchEditor(3I) 					    InterViews Reference Manual 					   MatchEditor(3I)

NAME
MatchEditor - StringEditor with pattern matching SYNOPSIS
#include <InterViews/matcheditor.h> DESCRIPTION
MatchEditor is a StringEditor subclass that checks the validity of its contents against a specified pattern. It is suitable for entering strings that must conform to a particular format such as a number or a file name. The matching pattern is specified according to the rules of scanf(3). For example, a pattern of "%3d" will match a 3-digit integer, a pattern of "%[ab]" will match a string containing only a's and b's, and a pattern of "(%f, %f)" will match the string "(12.0, 5E23)". PUBLIC OPERATIONS
MatchEditor(ButtonState*, const char* sample, const char* done) Create a new MatchEditor object. The ButtonState, sample string, and termination string are passed to the StringEditor constructor. void Match(const char* pattern, boolean keystroke = true) Specify the pattern to match against. When MatchEditor performs matching, it will highlight any trailing part of the edit string that does not conform to pattern. The user can then correct the string. If keystroke is true, matching will occur on every key- stroke; otherwise matching will only occur on the completion of the edit. The initial pattern matches any string, and the initial value of keystroke is true. RESTRICTIONS
MatchEditor uses sscanf internally to check the pattern match. Different versions of sscanf have different scanning capabilities; check with your local version to see what patterns you can use. SEE ALSO
StringEditor(3I) InterViews 7 Dec 1989 MatchEditor(3I)
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