$re = '/\$
(?=[^$]{3,100}\$)
(?<PH>[A-Za-z0-9:_-]{1,20})
(?:
(?<C1>\/)
(?<RX>(?:[^\\\\\/\r\n]|\\\\\/?)*)
\/
(?:
(?<R>(?:[^\\\\\/\r\n$]|\\\\[\/$]?)*)
\/
|
(?<G>\d*)
)
|
(?:
(?<C2>\()
(?<F>(?:[^\t\r\n\f()]|\\\\[()]?)*)
\)
)?
)
\$/mix';
$str = ' $EX1$ -> EX1
$EX2(a$b$c)$ -> EX2, (, a$b$c
$EX3(abc\\x/)$ -> EX3, (, abc\\x/
$EX4(\\@\\,/&/)$ -> EX4, (, \\@\\,/&/
$EX5/X(Z)Y/$ -> EX5, /, X(Z)Y
$EX6/X(ABC)/1$ -> EX6, /, X(ABC), 1
$EX7/X\\\\Z\\/Y/$ -> EX7, /, X\\\\Z\\/Y
$EX8/(A)/(B)/$ -> EX8, /, (A), (B)
$EX9/(\\\\$A$)\\//(\\\\$B$\\/)/$ -> EX9, /, (\\\\$A$)\\/, (\\\\$B$\\/)
Lorem Ip$um $EX1$i$ simply dummy $EX1$$EX2(abc)$ te$t of the printing and
type$EX2(abc)$etting indu$try. $EX3(abc\\x/)$ Lorem $EX4(\\@\\,/&/)$Ipsum has been the
industry\'$EX5/X(Z)Y/$ standard du$EX6/X(ABC)/1$mmy text $EX7/X\\\\Z\\/Y/$ ever $$$ince the
1500$EX8/(A)/(B)/$, when an $ unknown $EX9/(\\\\$A$)\\//(\\\\$B$\\/)/$ printer took a galley of type ';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php