regexp in switch statement

Question

Are regex\'s allowed in PHP switch/case statements and how to use them ?

Answer 1

No or only limited. You could for example switch for true:

switch (true) {
    case $a == 'A':
        break;
    case preg_match('~~', $a);
        break;
}

This basically gives you an if-elseif-else statement, but with syntax and might of switch (for example fall-through.)