Regex Capture Checker (in PHP)

regex_capture_checker.php

<?php
function regex_capture_checker($regex_pat, $strings) {
    foreach ($strings as $k => $v) {
        if (is_integer($k)) {
            $string = $v;
            $comp = false;
        } else {
            $string = $k;
            $comp = $v;
        }
        $ret = preg_match($regex_pat, $string, $capts);
        if ($comp!==false) echo $capts===$comp ? "PASS: ": "FAIL: ";
        echo "preg_match returned '"; var_export($ret);
        echo "' and captured: "; var_export($capts); echo"\n\n";
    }
}

echo "===== simple test, with just PASS / FAIL ====== \n\n";

regex_capture_checker('/^([-+]?[\d]+\.?[\d]*)(\s*)(.*)$/', array(
    '1.2.0',
    '-1 tag',
    '+2n',
    '2.0',
));

echo "===== now try checking capture groups against expected output ====== \n\n";

regex_capture_checker('/^([-+]?[\d]+\.?[\d]*)(\s*)(.*)$/', array(
    '1.2.0' => array ('1.2.0', '1.2', '',  '.0'), 
    '-1 tag'=> array ('-1 tag','-1',  ' ', 'tag'), 
    '+2n'   => array ('+2n',   '+2',  '',  'n'), 
    '2.0'   => array ('2.0',   '2.0', '', '' ), 
));