Generalize regex_replace_ex() function

1 files changed, 24 insertions, 5 deletions

diff --git a/libbutl/regex.hxx b/libbutl/regex.hxx
index e4fd6a7..2105f05 100644
--- a/libbutl/regex.hxx
+++ b/libbutl/regex.hxx
@@ -14,13 +14,18 @@
 
 namespace butl
 {
-  // Like std::regex_match() but extends the standard ECMA-262
-  // substitution escape sequences with a subset of Perl sequences:
+  // Call specified append() function for non-matched substrings and matched
+  // substring replacements returning true if search succeeded. The function
+  // must be callable with the following signature:
   //
-  // \\, \u, \l, \U, \L, \E, \1, ..., \9
+  // void
+  // append(basic_string<C>::iterator begin, basic_string<C>::iterator end);
   //
-  // Also return the resulting string as well as whether the search
-  // succeeded.
+  // The regex semantics is like that of std::regex_replace() extended the
+  // standard ECMA-262 substitution escape sequences with a subset of Perl
+  // sequences:
+  //
+  // \\, \u, \l, \U, \L, \E, \1, ..., \9
   //
   // Notes and limitations:
   //
@@ -34,6 +39,19 @@ namespace butl
   //   C++ locale (which is, unless changed, is the same as C locale and
   //   both default to the POSIX locale aka "C").
   //
+  template <typename C, typename F>
+  bool
+  regex_replace_ex (const std::basic_string<C>&,
+                    const std::basic_regex<C>&,
+                    const std::basic_string<C>& fmt,
+                    F&& append,
+                    std::regex_constants::match_flag_type =
+                      std::regex_constants::match_default);
+
+  // As above but concatenate non-matched substrings and matched substring
+  // replacements into a string returning it as well as whether the search
+  // succeeded.
+  //
   template <typename C>
   std::pair<std::basic_string<C>, bool>
   regex_replace_ex (const std::basic_string<C>&,
@@ -52,6 +70,7 @@ namespace std
   operator<< (ostream&, const regex_error&);
 }
 
+#include <libbutl/regex.ixx>
 #include <libbutl/regex.txx>
 
 #endif // LIBBUTL_REGEX_HXX