From 5dbf8fc33f375c0453eb462fd44fa20f25867dd2 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Fri, 16 Mar 2018 19:37:43 -0400
Subject: [PATCH] search and display match offset

---
 main.cc | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/main.cc b/main.cc
index 0fbb9fa..7d72f85 100644
--- a/main.cc
+++ b/main.cc
@@ -21,11 +21,11 @@ int main(int argc, char * argv[])
         return 1;
     }
 
-    static const char pattern[] = "\\<Foo\\d";
+    static const char pattern[] = "\\bFoo\\d+";
     OnigErrorInfo einfo;
     regex_t * regex;
     rc = onig_new(&regex, (const OnigUChar *)pattern,
-            (const OnigUChar *)(pattern + strlen(pattern)), ONIG_OPTION_NONE,
+            (const OnigUChar *)(pattern + strlen(pattern)), ONIG_OPTION_DEFAULT,
             ONIG_ENCODING_UTF8, ONIG_SYNTAX_DEFAULT, &einfo);
     if (rc != ONIG_NORMAL)
     {
@@ -35,6 +35,28 @@ int main(int argc, char * argv[])
         return 1;
     }
 
+    static const char data[] = "Hi Foo! BarFoo4! Foo42!";
+
+    int pos = onig_search(regex,
+            (OnigUChar *)data,
+            (OnigUChar *)(data + strlen(data)),
+            (OnigUChar *)data,
+            (OnigUChar *)(data + strlen(data)),
+            NULL, ONIG_OPTION_NONE);
+
+    if (pos >= 0)
+    {
+        fprintf(stderr, "Match at offset %d\n", pos);
+    }
+    else if (pos == ONIG_MISMATCH)
+    {
+        fprintf(stderr, "No match!\n");
+    }
+    else
+    {
+        fprintf(stderr, "Error!\n");
+    }
+
     onig_free(regex);
 
     return 0;