DSX[SIZE][PACKAGE][OPTIONS]-[FREQUENCY]
|    |      |        |          |
|    |      |        |          +-- Optional frequency suffix
|    |      |        +-- GA = AEC-Q200, G = standard ceramic
|    |      +-- Package suffix
|    +-- 3-digit size code (321 = 3.2x1.3mm)
+-- DSX = SMD crystal series

Example: DSX321G-12.000M
         |  | ||    |
         |  | ||    +-- 12 MHz frequency
         |  | |+-- (SMD ceramic)
         |  | +-- G = SMD ceramic package
         |  +-- 321 = 3.2x1.3mm
         +-- DSX = SMD crystal

Example: DSX530GA
         |  |  ||
         |  |  |+-- A = AEC-Q200 automotive grade
         |  |  +-- G = SMD ceramic
         |  +-- 530 = 5.0x3.2mm
         +-- DSX = SMD crystal

DST[SIZE][PACKAGE]
|    |      |
|    |      +-- S = SMD, other variants
|    +-- 3-digit size code (310 = 3.1x1.5mm)
+-- DST = Tuning fork crystal series

Example: DST310S
         |  | |
         |  | +-- S = SMD package
         |  +-- 310 = 3.1x1.5mm
         +-- DST = Tuning fork (32.768kHz typical)

DSO[SIZE][PACKAGE][OPTIONS]
|    |      |        |
|    |      |        +-- SDH = high stability, R = tape reel
|    |      +-- S = SMD
|    +-- 3-digit size code
+-- DSO = Clock oscillator series

Example: DSO321SR
         |  | ||
         |  | |+-- R = Tape and reel
         |  | +-- S = SMD package
         |  +-- 321 = 3.2x2.5mm
         +-- DSO = Clock oscillator

DSB[SIZE][PACKAGE][OPTIONS]
|    |      |        |
|    |      |        +-- SDA = automotive, other options
|    |      +-- S = SMD
|    +-- 3-digit size code
+-- DSB = SAW filter/resonator

Example: DSB321SDA
         |  |  ||
         |  |  |+-- A = AEC-Q200 automotive
         |  |  +-- SD = SMD automotive
         |  +-- 321 = 3.2x1.3mm
         +-- DSB = SAW device

1N-[FREQUENCY]
|      |
|      +-- Frequency in MHz (26.000 = 26 MHz)
+-- 1N = Through-hole crystal unit

Example: 1N-26.000
         |    |
         |    +-- 26.000 MHz
         +-- 1N series, HC-49U package

// DSX series - SMD crystals
"^DSX[0-9].*"
"^DSX[0-9]{3}G.*"  // With package suffix

// DST series - Tuning fork
"^DST[0-9].*"

// DSO series - Oscillators
"^DSO[0-9].*"
"^DSO[0-9]{3}S.*"  // SMD variant

// DSB series - SAW devices
"^DSB[0-9].*"

// 1N series - Through-hole
"^1N-[0-9].*"
"^1N[0-9].*"

String extractPackageCode(String mpn) {
    String upperMpn = mpn.toUpperCase();

    // DSX series: DSX321G -> 3.2x1.3mm
    if (upperMpn.startsWith("DSX")) {
        String sizeCode = upperMpn.substring(3, 6);  // e.g., "321"
        String packageSuffix = "";
        int idx = 6;
        while (idx < upperMpn.length() && Character.isLetter(upperMpn.charAt(idx))) {
            idx++;
        }
        packageSuffix = upperMpn.substring(6, idx);  // e.g., "G", "GA"
        return mapSizeCodeToPackage(sizeCode, packageSuffix);
    }

    // 1N series: always HC-49U
    if (upperMpn.startsWith("1N")) {
        return "HC-49U";
    }

    return "";
}

String extractFrequencyCode(String mpn) {
    String upperMpn = mpn.toUpperCase();

    // 1N series: 1N-26.000 -> 26.000
    if (upperMpn.startsWith("1N-")) {
        return upperMpn.substring(3);  // Everything after "1N-"
    }

    // DSX/DST/DSO: look for frequency suffix after last dash
    int lastDash = upperMpn.lastIndexOf('-');
    if (lastDash >= 0 && lastDash < upperMpn.length() - 1) {
        String freqPart = upperMpn.substring(lastDash + 1);
        if (freqPart.matches(".*\\d.*")) {
            return freqPart;
        }
    }

    return "";
}