30 lines
504 B
Go
30 lines
504 B
Go
package rcache
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import (
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"crypto/md5"
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"regexp"
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"sync"
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)
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var (
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cache map[[16]byte]*regexp.Regexp = map[[16]byte]*regexp.Regexp{}
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lock sync.RWMutex
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)
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func Get(expression string) *regexp.Regexp {
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key := md5.Sum([]byte(expression))
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lock.RLock()
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if cache[key] != nil {
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defer lock.RUnlock()
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return cache[key].Copy()
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}
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lock.RUnlock()
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if regex, err := regexp.Compile(expression); err == nil {
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lock.Lock()
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defer lock.Unlock()
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cache[key] = regex
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return cache[key].Copy()
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}
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return nil
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}
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