Singapore NRIC or FIN: a prefix letter saying the status and the century, seven digits, then a checksum letter. The letters at both ends make it unmistakable, which is rare for a national identifier.
Label: SG_NRIC
Pattern
(?<!\w)[STFGM]\d{7}[A-Z](?!\w)
Must be caught
Please bring your card, S1234567D, to the counter. → S1234567D
The pass number is G7654321X on the record. → G7654321X