To define your own regular expressions navigate to preferences the second icon in the menu in the title bar:

Navigate to:
Project > Segment skipping

From here, you can enter regular expressions to match segments which are not going to be loaded for translation. Here are some examples:

In the screenshot below you can see how the functionality is processing a Word document containing data that is excluded from translation by a regex expression.
Word document:

The product numbers and dates will not be included in the translation nor they will increase the word-count in the project:

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