thirdparty/patches/re2-2021-02-02-ignore-replace.patch

diff --git a/re2/re2.cc b/re2/re2.cc
index 85ba1f4..0f23c22 100644
--- a/re2/re2.cc
+++ b/re2/re2.cc
@@ -55,7 +55,8 @@ RE2::Options::Options(RE2::CannedOptions opt)
     case_sensitive_(true),
     perl_classes_(false),
     word_boundary_(false),
-    one_line_(false) {
+    one_line_(false),
+    ignore_replace_escape_(false) {
 }
 
 // static empty objects for use as const references.
@@ -1030,9 +1031,13 @@ bool RE2::Rewrite(std::string* out,
     } else if (c == '\\') {
       out->push_back('\\');
     } else {
-      if (options_.log_errors())
-        LOG(ERROR) << "invalid rewrite pattern: " << rewrite.data();
-      return false;
+      if (options_.ignore_replace_escape()) {
+        out->push_back(*s);
+      } else {
+        if (options_.log_errors())
+          LOG(ERROR) << "invalid rewrite pattern: " << rewrite.data();
+        return false;
+      }
     }
   }
   return true;
diff --git a/re2/re2.h b/re2/re2.h
index 09c1fbe..79fe995 100644
--- a/re2/re2.h
+++ b/re2/re2.h
@@ -665,7 +665,8 @@ class RE2 {
       case_sensitive_(true),
       perl_classes_(false),
       word_boundary_(false),
-      one_line_(false) {
+      one_line_(false),
+      ignore_replace_escape_(false) {
     }
 
     /*implicit*/ Options(CannedOptions);
@@ -709,6 +710,9 @@ class RE2 {
     bool one_line() const { return one_line_; }
     void set_one_line(bool b) { one_line_ = b; }
 
+    bool ignore_replace_escape() const { return ignore_replace_escape_; }
+    void set_ignore_replace_escape(bool b) { ignore_replace_escape_ = b; }
+
     void Copy(const Options& src) {
       *this = src;
     }
@@ -729,6 +733,7 @@ class RE2 {
     bool perl_classes_;
     bool word_boundary_;
     bool one_line_;
+    bool ignore_replace_escape_;
   };
 
   // Returns the options set in the constructor.