1 files changed, 80 insertions, 0 deletions
diff --git a/src/mongo/util/pcre_util.cpp b/src/mongo/util/pcre_util.cpp
new file mode 100644
index 00000000000..4f4dd3c63a8
--- /dev/null
+++ b/src/mongo/util/pcre_util.cpp
@@ -0,0 +1,80 @@
+/**
+ *    Copyright (C) 2019-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+#include "mongo/util/pcre_util.h"
+
+#include <fmt/format.h>
+
+#include "mongo/base/error_codes.h"
+#include "mongo/util/assert_util.h"
+#include "mongo/util/pcre.h"
+
+namespace mongo::pcre_util {
+
+using namespace fmt::literals;
+
+pcre::CompileOptions parseOptions(StringData optionFlags, StringData opName) {
+    pcre::CompileOptions opt = pcre::UTF;
+    for (char flag : optionFlags) {
+        switch (flag) {
+            case 'i':  // case insensitive
+                opt |= pcre::CASELESS;
+                continue;
+            case 'm':  // newlines match ^ and $
+                opt |= pcre::MULTILINE;
+                continue;
+            case 'x':  // extended mode
+                opt |= pcre::EXTENDED;
+                continue;
+            case 's':  // allows dot to include newline chars
+                opt |= pcre::DOTALL;
+                continue;
+            case 'u':
+                continue;
+            default:
+                uasserted(6527600, "{} invalid flag in regex options: {}"_format(opName, flag));
+        }
+    }
+    return opt;
+}
+
+std::string quoteMeta(StringData str) {
+    std::string result;
+    for (char c : str) {
+        if (c == '\0') {
+            result += "\\0";
+            continue;
+        }
+        if (!ctype::isAlnum(c) && c != '_' && !(c & 0x80))
+            result += '\\';
+        result += c;
+    }
+    return result;
+}
+
+}  // namespace mongo::pcre_util