diff --git a/core/src/strutil.c b/core/src/strutil.c
index d133af3..ef74370 100644
--- a/core/src/strutil.c
+++ b/core/src/strutil.c
@@ -13,3 +13,35 @@ uintptr_t strnhash(const char* s, size_t n) {
 uintptr_t strhash(const char* s) {
     return strnhash(s, strlen(s));
 }
+
+long strlast(const char* rbegin, const char* rend, char search) {
+    const char* itr = rbegin;
+    while(itr != rend)
+        if(*itr == search) return itr - rend;
+        else itr--;
+    return -1;
+}
+
+long strfirst(const char* begin, const char* end, char search) {
+    const char* itr = begin;
+    while(itr != end)
+        if(*itr == search) return itr - begin;
+        else itr++;
+    return -1;
+}
+
+long strfirst_pred(const char* begin, const char* end, CharPredFn pred) {
+    const char* itr = begin;
+    while(itr != end)
+        if(pred(*itr)) return itr - begin;
+        else itr++;
+    return -1;
+}
+
+long strlast_pred(const char* rbegin, const char* rend, CharPredFn pred) {
+    const char* itr = rbegin;
+    while(itr != rend)
+        if(pred(*itr)) return itr - rend;
+        else itr--;
+    return -1;
+}
diff --git a/core/src/strutil.h b/core/src/strutil.h
index 55e36af..1c43021 100644
--- a/core/src/strutil.h
+++ b/core/src/strutil.h
@@ -4,7 +4,13 @@
 #include "stdlib.h"
 #include "stdint.h"
 
+typedef int(*CharPredFn)(int);
+
 extern uintptr_t strnhash(const char* s, size_t n);
 extern uintptr_t strhash(const char* s);
+extern long strlast(const char* rbegin, const char* rend, char search);
+extern long strfirst(const char* begin, const char* end, char search);
+extern long strfirst_pred(const char* begin, const char* end, CharPredFn pred);
+extern long strlast_pred(const char* rbegin, const char* rend, CharPredFn pred);
 
 #endif // !_fencer_strutil_h