Let say you have the following list of temporary tables in SQL:

Notepad++ replace 1
#Temp_Table_1
#Temp_Table_2
#Temp_Table_3
#Temp_Table_4
#Temp_Table_5

and you want transform them into the following:

Notepad++ replace 3
IF OBJECT_ID('tempdb..#Temp_Table_1') IS NOT NULL DROP TABLE #Temp_Table_1
IF OBJECT_ID('tempdb..#Temp_Table_2') IS NOT NULL DROP TABLE #Temp_Table_2
IF OBJECT_ID('tempdb..#Temp_Table_3') IS NOT NULL DROP TABLE #Temp_Table_3
IF OBJECT_ID('tempdb..#Temp_Table_4') IS NOT NULL DROP TABLE #Temp_Table_4
IF OBJECT_ID('tempdb..#Temp_Table_5') IS NOT NULL DROP TABLE #Temp_Table_5

To do this in Notepad++, you can just hit CTRL + H for Replace window and the select the following:

Notepad++ replace 2