api: add regex replace feature in function string_eval_expression

ChangeLog.asciidoc

@@ -23,6 +23,7 @@ http://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
   of status bar
 * core: allow incomplete commands if unambiguous, new option
   weechat.look.command_incomplete (task #5419)
+* api: add regex replace feature in function string_eval_expression
 * api: use microseconds instead of milliseconds in functions util_timeval_diff
   and util_timeval_add
 * irc: display own nick changes in server buffer (closes #188)

src/core/wee-eval.h

@@ -20,6 +20,8 @@
 #ifndef WEECHAT_EVAL_H
 #define WEECHAT_EVAL_H 1
 
+#include <regex.h>
+
 #define EVAL_STR_FALSE      "0"
 #define EVAL_STR_TRUE       "1"
 
@@ -50,6 +52,13 @@ enum t_eval_comparison
     EVAL_NUM_COMPARISONS,
 };
 
+struct t_eval_regex
+{
+    const char *result;
+    regmatch_t match[100];
+    int last_match;
+};
+
 extern int eval_is_true (const char *value);
 extern char *eval_expression (const char *expr,
                               struct t_hashtable *pointers,