Question about searching in txt-file

[Gintaras]

Macro Macro1474

Code:

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str f="$temp$\big.txt"
str String="quickmacros"

;----------------------------

;This code creates file for testing. Delete this code if you already have the file.

_s=
;qqqq wwwww
;eee quickmacros ffffffff
;gggg hhhhhhhh
if !dir(f)
,_s.setfile(f)

;----------------------------

str s.getfile(f) line
if(findrx(s F"^.*\Q{String}\E[^\r\n]*$" 0 8 line)<0) out F"''{String}'' not found."; ret
out line