There are a few things to consider:
- What version of PHP is currently running on your server?
- What plugins do you have installed?
- Try de-activating plugins to determine which one is providing the errors.
- Backup & update Plugins / WordPress core.
If you are a developer, you answer can be found here: https://stackoverflow.com/questions/10159990/converting-an-ereg-replace-to-preg-replace
Chances are that your version of PHP or plugins need to be updated.
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