SEARCH AND REPLACE DEMONSTRATION

client_id=1001
client_id=1002
client_id=1003
client_id=1004
account_id=2001
invoice_id=3001

LITERAL SEARCH
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Find: customer_id
Replacement: client_id

REGULAR EXPRESSION SEARCH
-------------------------
Find: customer_id=[0-9]+
This matches the four customer identifier lines above.
The expression text below is reference material, not a match.

Use a copy if you want to test a replacement.