Swift mt field format rules

Question

Can someone point me to a document where the formatting rules for a MT message field are described?

For example I want to know what the following snippet means.

:4!c//3!a/3!a/15d

Answer 1

This is described in the MT 'General Information' documentation.

How to read :4!c//3!a/3!a/15d:

• first :
• then 4 mandatory c
• then //
• then 3 mandatory a
• then /
• then 3 mandatory a
• then /
• then maximum 15 d

A brief overview of the character types in regex:

• c is [A-Z0-9]
• a is [A-Z]
• d is \d+,\d*