JMS[SERIES][VARIANT][PACKAGE]    (USB-SATA bridges)
JMB[SERIES][VARIANT][PACKAGE]    (PCIe/SATA controllers)
JMF[SERIES][VARIANT][PACKAGE]    (Flash controllers)
JM20[SERIES][VARIANT][PACKAGE]   (Legacy IDE/SATA)
 |     |       |        |
 |     |       |        └── Package code (QFN, LQFP, BGA, etc.)
 |     |       └── Variant letter (optional)
 |     └── 3-digit series number
 └── JMS/JMB/JMF/JM20 prefix

JMS583-QFN
│  │  │
│  │  └── QFN package
│  └── 583 = USB 3.1 Gen2 to SATA/NVMe bridge
└── JMS = JMicron USB-SATA prefix

JMB585-LQFP
│  │  │
│  │  └── LQFP package
│  └── 585 = 5-port PCIe Gen3 SATA controller
└── JMB = JMicron board controller prefix

// JMS5xx series - USB to SATA bridge controllers
"^JMS5[0-9]{2}[A-Z]*.*"

// JMB5xx series - PCIe SATA/NVMe controllers
"^JMB5[0-9]{2}[A-Z]*.*"

// JMB3xx series - SATA port multiplier/host controllers
"^JMB3[0-9]{2}[A-Z]*.*"

// JMF series - Flash memory controllers
"^JMF[0-9]+[A-Z]*.*"

// JMB4xx series - USB bridge controllers (legacy)
"^JMB4[0-9]{2}[A-Z]*.*"

// JM20xxx series - IDE/SATA controllers (legacy)
"^JM20[0-9]{3}[A-Z]*.*"

// JMS/JMB series: prefix + 3 digits = 6 characters
// JMS583 -> JMS583
// JMB585 -> JMB585

if (upperMpn.matches("^JMS5[0-9]{2}.*")) {
    return upperMpn.substring(0, 6);
}

// JMF series: variable length digits
// JMF612 -> JMF612
// JMF667 -> JMF667

// JM20xxx series: 7 characters
// JM20330 -> JM20330

// Check hyphenated package codes first
// JMS583-QFN -> QFN

// Then check trailing letters after digits
// JMS583Q -> QFN (Q maps to QFN)

JMS539 (Level 1) < JMS567 (Level 2) < JMS578 (Level 3) < JMS583 (Level 4)