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Full Discussion: How to check string contain multiple tabs or spaces?
Top Forums UNIX for Beginners Questions & Answers How to check string contain multiple tabs or spaces? Post 303032549 by cmdcmd on Wednesday 20th of March 2019 09:30:41 AM
Old 03-20-2019
How to check string contain multiple tabs or spaces?
str contains tabs and multiple spaces
Code:
str="hello                       world. How are    you?"

I want to check string start with hello world,
and my code is:

Code:
if [[ $str == "hello[[:blank:]]world"* ]]; then
  echo "found"
else
  echo "not found"
fi

Not work

Other solution may work is to replace all tabs and spaces with a single space. I googling and found a solution

Code:
	shopt -s extglob
	temp=$(echo "${str//+([[:blank:]])/ }")
	if [[ $temp == "hello world"* ]]; then
		echo "found"
	fi

But I don't want to replace, just check in condition. I am new to shell, sorry.
 

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LEARN ABOUT PHP

expand

EXPAND(1)							   User Commands							 EXPAND(1)

NAME

       expand - convert tabs to spaces

SYNOPSIS

       expand [OPTION]... [FILE]...

DESCRIPTION

       Convert tabs in each FILE to spaces, writing to standard output.

       With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -i, --initial
	      do not convert tabs after non blanks

       -t, --tabs=N
	      have tabs N characters apart, not 8

       -t, --tabs=LIST
	      use  comma  separated  list of tab positions The last specified position can be prefixed with '/' to specify a tab size to use after
	      the last explicitly specified tab stop.  Also a prefix of '+' can be used to align remaining tab stops relative to the  last  speci-
	      fied tab stop instead of the first column

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report expand translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       unexpand(1)

       Full documentation at: <http://www.gnu.org/software/coreutils/expand>
       or available locally via: info '(coreutils) expand invocation'

GNU coreutils 8.28						   January 2018 							 EXPAND(1)
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