My ETSI TS 103 280 notes

IMSI

IMSI, International Mobile Subscriber Identity, written as decimal digits.
Example: 204081234567890
Regular expression: ^[0-9]{6,15}$
XSD: IMSI, simpleType
ASN.1: NumericString (SIZE(6..15))

NAI

NAI, Network Access Identifier following the format given in IETF RFC 7542. Usage guidance In general an NAI will take the form "username@realm".
Example user@homerealm.example.net
Regular expression 
XSD: NAI, simpleType
ASN.1: NAI, UTF8String

SUPIIMSI

SUPIIMSI, Subscription Permanent Identifier as defined in 3GPP TS 123 501, in IMSI representation.
Regular expression, XSD, and ASN.1: See definition of IMSI

SUPINAI

SUPINAI, Subscription Permanent Identifier as defined in 3GPP TS 123 501 in NAI representation.
Regular expression, XSD, ASN.1: See definition of NAI