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Full Discussion: Find first digit in string using expr index
Top Forums Shell Programming and Scripting Find first digit in string using expr index Post 302233187 by era on Saturday 6th of September 2008 01:40:36 PM
Old 09-06-2008
What I had in mind yesterday, but didn't have time to finish, was something along the following lines.

Code:
vnix$ s=dsfg123456sdf
vnix$ echo ${s#*[0-9]}
23456sdf
vnix$ echo ${s#${s#*[0-9]}?}
dsfg123456sdf
vnix$ echo ${s%?${s#*[0-9]}}
dsfg
vnix$ echo ${s#${s%?${s#*[0-9]}}}
123456sdf
vnix$ t=${s#${s%?${s#*[0-9]}}}
vnix$ echo ${t%[0-9]*}
12345
vnix$ echo ${t#${t%[0-9]*}?}
sdf
vnix$ echo ${t%${t#${t%[0-9]*}?}}
123456

It's probably too cumbersome to be of much practical utility, but it does work without any external command (as long as there is a single numeric substring).

Here's another rather monstrous idea (you can do it without Perl, although I would hate to have to):

Code:
vnix$ s=sdfd345sdfg436efg
vnix$ OLDIFS=$IFS
vnix$ IFS=`perl -e 'print map { chr($_) } (0..0x2F, 0x3A..0x7E)'`
vnix$ set -- $s
vnix$ IFS=$OLDIFS
vnix$ echo "$@"
    345    436

 

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LEARN ABOUT OPENSOLARIS

echo

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)
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