RegexMatch was compiling regex patterns on every call via regexp.MatchString, causing repeated allocations and compilation overhead.

Changes

Changed RegexMatch to use the existing mustCompileOrGet caching mechanism:

// Before
func RegexMatch(key1 string, key2 string) bool {
    res, err := regexp.MatchString(key2, key1)
    if err != nil {
        panic(err)
    }
    return res
}

// After
func RegexMatch(key1 string, key2 string) bool {
    re := mustCompileOrGet(key2)
    return re.MatchString(key1)
}

Impact

• 0 B/op - eliminates per-call allocations
• ~200 ns/op - benchmark shows consistent performance
• Thread-safe via existing sync.RWMutex in cache
• Improves KeyMatch2, KeyMatch3, KeyMatch5 (all call RegexMatch)
• Identical panic behavior on invalid patterns

Added benchmarks to verify performance improvement.

• Fixes [feature] change all regex in xxx match functions to pre-compiled to boost performance #1690

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