find string with regex in php -

i new regex , therefore gone through php manual regex , tried below:

i have string this:

c-1

c-10

c-100 , on upto c-unlimited

now want confirm string coming valid string starts c- , after c- contains numbers..

to work have used preg_match

$slug='c-12';  if(preg_match("/\[c-(.*?)]/",$slug,$result)){ echo "true";} else{ echo "false"; } 

also this:

$pattern = '/^c-/'; if(preg_match($pattern, substr($slug,2), $matches, preg_offset_capture){ echo "true";} else{ echo "false"; } 

and this:

$pattern = '/^c-/'; if(preg_match($pattern, $slug, $matches, preg_offset_capture, 3){ echo "true";} else{ echo "false"; } 

and 1 more thing wanted to validate string end. below:

 $slug="my-string-content-123"; 

here wanted validate string contains number @ end after -

example 123

but not able work... , sorry bad english..

any or suggesstion great help.. in advance..

for common (not c-) case:

$slug="my-string-content-123"; if(preg_match('/([^0-9]+)-([0-9]+)$/', $slug, $matches)) {    //prefix in $matches[1];    //the number in $matches[2]; }