The best answer depends on the things you haven't told us, like

If both is true use the flip-flop operator .. to match start and end of a block.

Use a normal regex to match the insides.

edit

if( /block-start/ .. /block-end/ ) { 
    $block .= $line;
    $hit = 1 if /match-plz/; 
} else {
    print $block if $hit;
    $block = $hit = undef;            # reset
}

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Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re: Matching a string in a parenthesized block (regex help) by LanX
in thread Matching a string in a parenthesized block (regex help) by maxamillionk

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