Standardizing Measurements field in biography

Allow only numeric value, no alphabetic characters. Standardizing the information makes it look cleaner and more consistent.
The example in the biography denotes this ("suggested format example: 42-25-36"). Sometimes, users include cup size in the field. The Bra/cup field makes putting it in the Measurements field redundant.
Additionally, some users add "B", "W", "H" when it is already implied.
Also, there are sometimes slashes ("/") or spaces between the numeric values.