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I am trying to understand (find in the code) how q2a filters the tags and remove special characters.

When posting e.g. "graph! dogs# test? test2` " it results in a cleaned tagstring:

graph dogs# test test2

But I cannot find the function in the code doing it.

I found only:
- qa_post_tags_to_tagstring($tags)
- qa_tags_to_tagstring()

But these functions are only splitting the tagstring.

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