Deleting values / lines from a single text file code changing to deleting from multiple fi

I've got the following code which allows me to delete lines from a text file based on a input value i.e. a date 001:2003 etc etc The code works fine for one file at a time , but how could I modify it so as it looks at all files in a directory and modifies them accordingly?

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I will add them for you - this time