php - Preg Match a string with $, numbers, and letters -

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i'm trying preg_match string. 

$word = "$1$s";  or  $word = "$2$s"  if(preg_match('/^\$[1-9]{1}\$s$/' ,$word)){    echo 'true'; } else {   echo 'false'; }

i tried not giving true result. how can make true.

php trying render variable $s in double quoted string. use single quotes instead , can remove {1} inside regular expression because not necessary.

$word = '$1$s';  if (preg_match('/^\$[1-9]\$s$/', $word)) {     echo 'true'; } else {     echo 'false'; }

you can escape $ in double quoted string:

$word = "$1\$s"; // note $1 doesn't need escaped since variables can't start numbers

finally, can see why wasn't working seeing $word equaled (with error reporting enabled):

$word = "$1$s"; // notice: undefined variable: s on line # echo $word;     // $1

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