50 lines
1.2 KiB
Go
50 lines
1.2 KiB
Go
/*
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* owobot - Your server's guardian and entertainer
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* Copyright (C) 2023 owobot Contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package cache
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import (
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"regexp"
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"sync"
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)
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var (
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regexMtx = sync.RWMutex{}
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regexes = map[string]*regexp.Regexp{}
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)
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func Regex(regex string) (*regexp.Regexp, error) {
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regexMtx.RLock()
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if re, ok := regexes[regex]; ok {
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regexMtx.RUnlock()
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return re, nil
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}
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regexMtx.RUnlock()
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re, err := regexp.Compile(regex)
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if err != nil {
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return nil, err
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}
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regexMtx.Lock()
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regexes[regex] = re
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regexMtx.Unlock()
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return re, nil
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}
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