To define your own regular expressions navigate to preferences the second icon in the menu in the title bar:
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.
The product numbers and dates will not be included in the translation nor they will increase the word-count in the project: