c# - Need help in building regular expression -

what regular expression

od -0d  -123d  -145y  234w  , not +234d or -678m etc. 

i have

string exp_regex_valid_literal = @"[0-9]*[d|d|w|w|m|m|q|q|y|y]"; regex regex = new regex(exp_regex_valid_literal); return regex.ismatch(inputstring); 

but failing "/0345d"

validation rules:

the expression alphanumeric one(where alphabets optional) alphabets can d|d|w|w|m|m|q|q|y|y , can appear after numerals. if character can come before numerals can minus.so -123 valid or -123d or 123d or 123w valid. not 23dw or +12d etc.

thanks

if understand want, may work:

/^-?\d+[dwmqy]$/i 

c# syntax (not quite sure):

regex.match("/0123d", "^-?\d+[dwmqy]$",regexoptions.ignorecase); 

where:

^   begining of string -?  optionnal - \d+ 1 or more digits [dwmqy]  1 of these char $   end of string    case insensitive