Question

I want to validate string only if contains numerics and/or ‘h’ or ‘H’ character anywhere in the string.

e.g.

123 – valid
123h – valid
1h23 – valid
h234 – valid
123H – valid
asdf – invalid
123d – invalid

I am able to restrict string for numerics only but not with additional requirement of h. how can I do this?

Answer 1

^\d*h?\d*$

Together with the ignore case option.

See it here on Regexr

^ anchor to the start of the string.

\d* match 0 or more digits

h? match 0 or 1 h

\d* match 0 or more digits

$ anchor to the end of the string.