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ccce1e928a
issue: https://github.com/milvus-io/milvus/issues/32482 --------- Signed-off-by: longjiquan <jiquan.long@zilliz.com>
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License
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#include <re2/re2.h>
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#include "common/RegexQuery.h"
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namespace milvus {
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bool
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is_special(char c) {
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// initial special_bytes_bitmap only once.
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static std::once_flag _initialized;
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static std::string special_bytes(R"(\.+*?()|[]{}^$)");
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static std::vector<bool> special_bytes_bitmap;
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std::call_once(_initialized, []() -> void {
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special_bytes_bitmap.resize(256);
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for (char b : special_bytes) {
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special_bytes_bitmap[b + 128] = true;
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}
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});
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return special_bytes_bitmap[c + 128];
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}
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std::string
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translate_pattern_match_to_regex(const std::string& pattern) {
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std::string r;
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r.reserve(2 * pattern.size());
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bool escape_mode = false;
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for (char c : pattern) {
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if (escape_mode) {
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if (is_special(c)) {
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r += '\\';
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}
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r += c;
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escape_mode = false;
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} else {
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if (c == '\\') {
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escape_mode = true;
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} else if (c == '%') {
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r += "[\\s\\S]*";
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} else if (c == '_') {
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r += "[\\s\\S]";
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} else {
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if (is_special(c)) {
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r += '\\';
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}
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r += c;
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}
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}
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}
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return r;
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}
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} // namespace milvus
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