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<?php preg_match_all( '/\[([\w]*?)\:([\w\W\s]*?)\]/' , '[email:optin|<u>Optin</u>]' , $matches); echo $class = "Frontburner_Tag_" . ucfirst( trim( strtolower( $matches[1][0] ) ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/FUaiG
function name:  (null)
number of ops:  20
compiled vars:  !0 = $matches, !1 = $class
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'preg_match_all'
         1        SEND_VAL                                                 '%2F%5C%5B%28%5B%5Cw%5D%2A%3F%29%5C%3A%28%5B%5Cw%5CW%5Cs%5D%2A%3F%29%5C%5D%2F'
         2        SEND_VAL                                                 '%5Bemail%3Aoptin%7C%3Cu%3EOptin%3C%2Fu%3E%5D'
         3        SEND_REF                                                 !0
         4        DO_ICALL                                                 
   4     5        INIT_FCALL                                               'ucfirst'
         6        INIT_FCALL                                               'trim'
         7        INIT_FCALL                                               'strtolower'
         8        FETCH_DIM_R                                      $3      !0, 1
         9        FETCH_DIM_R                                      $4      $3, 0
        10        SEND_VAR                                                 $4
        11        DO_ICALL                                         $5      
        12        SEND_VAR                                                 $5
        13        DO_ICALL                                         $6      
        14        SEND_VAR                                                 $6
        15        DO_ICALL                                         $7      
        16        CONCAT                                           ~8      'Frontburner_Tag_', $7
        17        ASSIGN                                           $9      !1, ~8
        18        ECHO                                                     $9
        19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0