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Can it only work on piped input? I tried running in the form of `./purl main.go -filter func` and the result was:

> Failed to validate input: invalid replace expression format. Use "@search@replace@"

Do you plan to add the ability for it to act on files directly?

Thank you for trying out purl! Currently, the file name needs to be placed at the end of the command like this: purl -filter func main.go. This format helps purl understand which part of the command specifies the options and which part specifies the file.

I appreciate your feedback and understand that a more flexible command structure might be easier for users. We will consider making this change in future versions to accommodate different usage preferences.

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