select 
t1.com,
left(t1.com,instr(t1.com,':')-1) as e,
mid(t1.com,instr(t1.com,':')+1,50) as e2
 from (
select 
substring_index(
		substring_index(
			t.com,
			',',
			b.help_topic_id + 1
		),
		',' ,- 1
	) AS com
 from (
select 'f005:13466664685,f0006:3667477,f0008:3555' as com
) t 
JOIN mysql.help_topic b ON b.help_topic_id < (
	length(t.com) - length(
		REPLACE (t.com, ',', '')) + 1)
) t1
