Java - Error with an MD5 string check and REGEX -

i don't understand why doesn't work. , problem is.

public class md5hash { public static void main(string []args){     string md5hash = "69a329523ce1ec88bf63061863d9cb14";     system.out.println(md5hash);     system.out.println(md5hash.matches("[a-f0-9] {32}")); }} 

in order use md5hash.matches, needed compare char char. perhaps don't understand greedy quantifier {32} does?

and appreciated, thanks.

spaces in regular expressions significant. first part of regex matches single hex char, , second part asks match 32 spaces. need remove space. might want allow upper-case variant. so, should want:

system.out.println(md5hash.matches("[a-fa-f0-9]{32}"));