- print_r: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$text = "PHP [gallery-1]. [gallery-2]";
if (preg_match_all("/\b\[gallery-\b/i", $text, $matches, PREG_OFFSET_CAPTURE)) {
print_r($matches);
$position = $matches[0][0][1];
} else {
echo "A match was not found.";
}