Recognize tokens even if not a a complete plain string

[dontub]

Sometimes the word processing application creates XML code like this:

<w:r><w:t>{contact.custom_</w:t></w:r><w:r w:rsidR="001A32C1"><w:t>7</w:t></w:r><w:r><w:t>1}</w:t></w:r>

In the application it is displayed as {contact.custom_71}. However, it is not recognized as token and users are wondering, why it is not replaced (and are unable to fix it). These kind of tokens should also be recognized.