What should be the regular expression which matches exactly one $ (dollar) followed by any number of digits?

Question

$ : match results $
$637 : match results $637
$$ : match results $
$272$ : match results $272
$262$$ : match results $272
$$445: match results $
3727 : match results null
2727$: match results null

Answer 1

$ is a special character that represents the end of the string.

Escaping the dollar symbol should solve your problem:

^\$\d*