how to search texts of stored procedures

Lots of stored procedures on the ms sql
and you're looking for one of wich text contains 'bla'

so here is the query :

SELECT ROUTINE_NAME, ROUTINE_DEFINITION
FROM INFORMATION_SCHEMA.ROUTINES
WHERE /*ROUTINE_NAME */ROUTINE_DEFINITION LIKE '% sp_executesql%'
AND ROUTINE_TYPE='PROCEDURE'


here
ROUTINE_NAME: name of stored procedure
ROUTINE_DEFINITION: text of stored procedure