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PHP remove garbage from a string

I'm stuck in a problem, I use a very simple RTE to get user input and clipping garbage from a string when it's published using the functions provided by RTE. I am using http://premiumsoftware.net/cleditor

After the user submits the data, I will analyze it using PHP and delete the inappropriate content. Most users are Linux / Mac users, and they usually copy content from Word emails / documents and paste them into RTE, causing a lot of junk.

We also need to allow all UTF8 characters from any language.

Saying all this, check out this image

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