From 3fa012b75b14abd69c7bc67c27ae50cb9ba4c343 Mon Sep 17 00:00:00 2001
From: Sadie Powell
Date: Sun, 26 Sep 2021 20:41:19 +0100
Subject: Add regex_pcre compatibility to regex_pcre2.

---
 src/modules/extra/m_regex_pcre2.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/modules')

diff --git a/src/modules/extra/m_regex_pcre2.cpp b/src/modules/extra/m_regex_pcre2.cpp
index a8e9c535a..c0acd627d 100644
--- a/src/modules/extra/m_regex_pcre2.cpp
+++ b/src/modules/extra/m_regex_pcre2.cpp
@@ -75,15 +75,34 @@ class PCRE2Pattern final
 	}
 };
 
+class PCRECompatEngine final
+	: public Regex::Engine
+{
+public:
+	PCRECompatEngine(Module* Creator, const std::string& Name)
+		: Regex::Engine(Creator, Name)
+	{
+		if (!ServerInstance->Config->ConfValue("pcre2")->getBool("compat"))
+			DisableAutoRegister();
+	}
+
+	Regex::PatternPtr Create(const std::string& pattern, uint8_t options) override
+	{
+		return std::make_shared<PCRE2Pattern>(pattern, options);
+	}
+};
+
 class ModuleRegexPCRE2 final
 	: public Module
 {
  private:
+	PCRECompatEngine compatregex;
 	Regex::SimpleEngine<PCRE2Pattern> regex;
 
  public:
 	ModuleRegexPCRE2()
 		: Module(VF_VENDOR, "Provides the pcre2 regular expression engine which uses the PCRE2 library.")
+		, compatregex(this, "pcre")
 		, regex(this, "pcre2")
 	{
 	}
-- 
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