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Here is a solution in groovy. It is based on the pseudo code above , but is more complete , since there are some cases that are not covered by the previous one.
- Kournjaev February 13, 2012boolean match(String regex,String str){
if (regex == null || str == null)
throw new NullPointerException()
if (regex.empty && str.empty)
return true
if (regex.empty && str.length() > 0 || str.empty)
return false
if (regex.charAt(0) == '.')
return match(regex.substring(1),str.substring(1))
if (regex.charAt(0) == '*')
if (str.charAt(0) == regex.charAt(1))
return match(regex.substring(2),str.substring(1)) || match(regex,str.substring(1))
else
return match(regex,str.substring(1))
return regex.charAt(0) == str.charAt(0) ? match(regex.substring(1),str.substring(1)) : false;
}