To be proper pascal case a word with digits allowed and with upto 3 upper case letters, a word:

• MUST start with an upper case alphabet (A through Z)
• MUST have no digits (0 - 9)
• MUST have no spaces, punctuation or special characters
• CAN have at most 1 uppercase alphabet in a row
• CAN end in an uppercase alphabet

Notable examples

• Aabc123 is valid pascal case with digits allowed
• Pascal2Case is valid pascal case with digits allowed
• Pascal2CaseA is valid pascal case with digits allowed
• Mode2A is valid pascal case with digits allowed
• Mode2A2 is valid pascal case with digits allowed
• Mode2A2A is valid pascal case with digits allowed