Java String Regular Expression

I have written below regex for two lines.

String LN1Pattern = "^((?=.{1,35}$)(/([A-Z]{1,5})(|(//[a-zA-Z0-9]+))))$";
System.out.println("/ABC//FGhiJkl012345".matches(LN1Pattern));
 
String LN2Pattern = "^(|((s+(//[a-zA-Z0-9]{1,33})){1,2}))$";
System.out.println("".matches(LN2Pattern));

s+ is a newline character.

But when I combines both as below, its not giving me expected result.

^(((?=.{1,35}$)(/([A-Z]{1,5})(|(//[a-zA-Z0-9]+))))(|((s+(//[a-zA-Z0-9]{1,33})){1,2})))$

For string "/ABC//FGhiJkl012345

//abCD01EF02" - returns False. Expected is True

I think there is some problem in lookahead placed.