lib/pcre/UniqueRegex: add Compile() overload with std::string_view

Author: MaxKellermann

src/lib/pcre/UniqueRegex.cxx

@@ -27,3 +27,25 @@ UniqueRegex::Compile(const char *pattern, const int options)
 	    pcre2_pattern_info_8(re, PCRE2_INFO_CAPTURECOUNT, &n) == 0)
 		n_capture = n;
 }
+
+void
+UniqueRegex::Compile(std::string_view pattern, const int options)
+{
+	int error_number;
+	PCRE2_SIZE error_offset;
+	re = pcre2_compile_8(PCRE2_SPTR8(pattern.data()), pattern.size(),
+			     options,
+			     &error_number, &error_offset,
+			     nullptr);
+	if (re == nullptr) {
+		const auto msg = FmtBuffer<256>("Error in regex at offset {}",
+						error_offset);
+		throw Pcre::MakeError(error_number, msg);
+	}
+
+	pcre2_jit_compile_8(re, PCRE2_JIT_COMPLETE);
+
+	if (int n; (options & PCRE2_NO_AUTO_CAPTURE) == 0 &&
+	    pcre2_pattern_info_8(re, PCRE2_INFO_CAPTURECOUNT, &n) == 0)
+		n_capture = n;
+}

src/lib/pcre/UniqueRegex.hxx

@@ -7,6 +7,7 @@
 #include "Options.hxx"
 #include "RegexPointer.hxx"
 
+#include <string_view>
 #include <utility>
 
 class UniqueRegex : public RegexPointer {
@@ -17,6 +18,10 @@ public:
 		Compile(pattern, options);
 	}
 
+	UniqueRegex(std::string_view pattern, Pcre::CompileOptions options) {
+		Compile(pattern, options);
+	}
+
 	UniqueRegex(UniqueRegex &&src) noexcept:RegexPointer(src) {
 		src.re = nullptr;
 	}
@@ -36,8 +41,13 @@ public:
 	 * Throws Pcre::Error on error.
 	 */
 	void Compile(const char *pattern, int options);
+	void Compile(std::string_view pattern, int options);
 
 	void Compile(const char *pattern, Pcre::CompileOptions options={}) {
 		Compile(pattern, (int)options);
 	}
+
+	void Compile(std::string_view pattern, Pcre::CompileOptions options={}) {
+		Compile(pattern, (int)options);
+	}
 };