Display all biochemical reactions whose descriptions contain the term introduced

Database: 
Statement: 
Display all biochemical reactions whose descriptions contain the term introduced $term$ (e.g. G proteins)
A limit of resuls per page $number$
Query: 
select* where{ ?s<http://www.w3.org/1999/02/22-rdf-syntax-ns#type><http://www.biopax.org/release/biopax-level3.owl#BiochemicalReaction> . ?s<http://www.biopax.org/release/biopax-level3.owl#comment>?description FILTER regex (?description, "??term", "i") } limit ??number