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my $content = get $url;

*.*$left_string $unknown_search_sting $right_string*.*\n

"blablaaaa_SES_bbbblala"
"reettaaa_SOS999_bbbtzz"
"wertzaaa_T541_bbbaqyyyyyyy"
"ffaaa_SES_bbbwwwwwwwww"

$left_string = "aaa_"
$right_string = "_bbb"

SES 2
SOS999 1
T541 1