Shell Programming and Scripting

#!/bin/perl -w

my $VAR = "some value";

if ( $VAR =~ /^[a-zA-Z]+?=[\.\/a-zA-Z0-9_-]+?$/ ) {
        print "match\n";
} else {
        print "no match\n";
}

#!/bin/bash

VAR="some value"


RESULT=$( echo $VAR | egrep ^[a-zA-Z]+?=[\.\/a-zA-Z0-9_-]+?$ )

if [ -z $RESULT ]; then
        echo bad
else
        echo good
fi

for v in 'ko=a|b' 'ok=0_/'; do
  [[ $v =~ ^[[:alpha:]]+=[./[[:alnum:]_-]+$ ]] &&
    printf '$v is ok: %s\n' "$v" ||
          printf '$v is not ok: %s\n' "$v"
done

$v is not ok: ko=a|b
$v is ok: ok=0_/

#!/bin/bash

VAR="serial=1234"

[[ $VAR =~ ^[a-zA-Z]+?=[\.\/a-zA-Z0-9_-]+?$ ]] && printf '$VAR is ok: %s\n' "$VAR"  || printf '$VAR is not ok: %s\n' "$VAR"

# /tmp/test.sh
$VAR is not ok: serial=1234