Search-Form Spam – Javascript being inputted via the search-form

Hi Support,

Today I reviewed the website search-form results, (I’m using the Relevanssi plugin), and found a great deal (000’s in past months) of search entries like this. I wasn’t able to find any suggestions online how to prevent these bot-attacks (I think they are automated bots!). Could you offer any advice about how best to protect the search form.

.net1111111111111″ UNION SELECT CHAR(45,120,49,45,81,45),CHAR(45,120,50,45,81,45),CHAR(45,120,51,45,81,45),CHAR(45,120,52,45,81,45),CHAR(45,120,53,45,81,45),CHAR(45,120,54,45,81,45) — /* order by “as
.net” or (1,2)=(select*from(select

name_const(CHAR(111,108,111,108,111,115,104,101,114),1),name_const(CHAR(111,108,111,108,111,115,104,101,114),1))a) — “x”=”x

.net99999″ union select unhex(hex(version())) — “x”=”x

php’ or (1,2)=(select*from(select name_const(CHAR(111,108,111,108,111,115,104,101,114),1),name_const(CHAR(111,108,111,108,111,115,104,101,114),1))a) — ‘x’=’x

php browser99999′ union select unhex(hex(version())) — ‘x’=’x

Many thanks in advance,
Paul