Thx toolic

Your solution is exactly the solution I also am using to overcome and it works enough for me.

Before my very first posting I was doing (in a loop):

$word =~ /^(\d)\st=(\S+)/;
next if ($1 == 0);
print "$2\n";

[download]
But in this way, for $word="0", pattern was not matched so previous loop's $1 and $2 was printed. And program functioned incorrectly.

Anyway, now I am doing: 

next if(!($word =~ /(\d)\st=(\S+)/));
print "$2\n";

[download]
and it works ok for my task.

I thank you for your replies.

In reply to Re^3: string selection from a character class by karden
in thread string selection from a character class by karden

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