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$txt_original="Arkarmit ithaaatokkk ide? aaaztamindenit. tokkkal-vonoval";
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$txt_replaced=$txt_original;
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# megkeressuk a szukseges mintat
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$txt_replaced =~ /aaa(\w{5})/;
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# Ami a $1-be kerul. Onnan atmentjuk $text_to_replace -be
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$text_to_replace=$1;
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$txt_replaced =~ s/$text_to_replace/12345/g;
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print("To replace: ${text_to_replace}\n");
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print("Original: ${txt_original}\n");
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print("Replaced: ${txt_replaced}\n");
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# output:
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# -------
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#
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# Replaced: Arkarmit ithaaa12345 ide? aaa12345ndenit. tokkkal-vonoval
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# Original: Arkarmit ithaaatokkk ide? aaaztamindenit. tokkkal-vonoval
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# Replaced: Arkarmit ithaaa12345 ide? aaaztamindenit. 12345al-vonoval