The following example shows you how to search the database's triggers for a string using MS SQL Server 2000-2017
-- Search all Triggers (rev 1)
-- Usage: Replace '%...%' with you search string
SELECT
Tables.Name TableName,
Triggers.name TriggerName,
Triggers.crdate TriggerCreatedDate,
Comments.Text TriggerText
FROM
sysobjects Triggers
Inner Join sysobjects Tables On Triggers.parent_obj = Tables.id
Inner Join syscomments Comments On Triggers.id = Comments.id
WHERE
Triggers.xtype = 'TR' and Tables.xtype = 'U'
and Comments.Text like '%...%'
ORDER BY Tables.Name, Triggers.name