Conditional text in a positive lookbehind grep sequence

[LynxKx]

I'm trying to create a grep string that will subscript a symbol but only after specific words and not all instances of the symbol. 

In the example below I want the % subscripted when used after Melon and Apple but no other use of % should be subscripted.

I cant figure out what I'm doing wrong?

(?<=[Grape|Orange|Apple|Bananna|Avocado|Melon|Pineapple])%

 

[Robert at ID-Tasker]

[] is for any Character from the list - you should rather use () instead. 

[FRIdNGE · Accepted solution]

Robert,

Bad answer! …

Right Grep syntax:

(Grape|Orange|Apple|Bananna|Avocado|Melon|Pineapple)\K%

(?<= …) just doesn't work with such a variable list!

(^/)  The Jedi

[LynxKx]

Oooh I have not used \K ... thank you!!!