Easy way to tell if a string is contained in another string that is a comma delimited list

Question

I am working in Talend so need a one-liner if possible to determine if string1 is a value in string2 which is a comma delimited list.

For example string1=foo and string2=foo,bar,red,green it would be true.

I was using contains but the issue is it matches on string2=fool,bar,red,green... in this case I want false

Answer 1

boolean result = Arrays.asList(string2.split(",")).contains(string1);

This is one approach, but depends on timeComplexity requirements as well. Using regex can be another approach

Answer 2

Another option using regex is:

String string1 = "\\bfoo\\b";                
String string2 = "bar, foo ,red,green";        

System.out.println(Pattern.compile(string1).matcher(string2).find());