diff --git a/Makefile b/Makefile
index 0ddff9961ac76..e4c338a580fcf 100644
--- a/Makefile
+++ b/Makefile
@@ -143,6 +143,11 @@ ifdef LLAMA_PERF
 	CFLAGS   += -DGGML_PERF
 	CXXFLAGS += -DGGML_PERF
 endif
+ifdef LLAMA_USE_BOOST
+	LDFLAGS += -L/usr/lib/x86_64-linux-gnu/ -lboost_regex
+	CFLAGS += -DLLAMA_USE_BOOST
+	CXXFLAGS += -DLLAMA_USE_BOOST
+endif
 ifneq ($(filter aarch64%,$(UNAME_M)),)
 	# Apple M1, M2, etc.
 	# Raspberry Pi 3, 4, Zero 2 (64-bit)
diff --git a/examples/common.cpp b/examples/common.cpp
index f3085b08e5b25..84380e4603aaf 100644
--- a/examples/common.cpp
+++ b/examples/common.cpp
@@ -333,6 +333,24 @@ bool gpt_params_parse(int argc, char ** argv, gpt_params & params) {
                 break;
             }
             params.input_suffix = argv[i];
+        } else if (arg == "--allowed-response-regex") {
+            if (++i >= argc) {
+                invalid_param = true;
+                break;
+            }
+            params.allowed_regex = argv[i];
+        } else if (arg == "--response-bias-regex") {
+            if (++i >= argc) {
+                invalid_param = true;
+                break;
+            }
+            params.bias_regex = argv[i];
+        } else if (arg == "--response-bias-value") {
+            if (++i >= argc) {
+                invalid_param = true;
+                break;
+            }
+            params.bias_regex_value = std::stof(argv[i]);
         } else {
             fprintf(stderr, "error: unknown argument: %s\n", arg.c_str());
             gpt_print_usage(argc, argv, default_params);
diff --git a/examples/common.h b/examples/common.h
index 499671b2e8d6d..0c89e586bcb52 100644
--- a/examples/common.h
+++ b/examples/common.h
@@ -49,6 +49,9 @@ struct gpt_params {
     std::string path_prompt_cache = "";  // path to file for saving/loading prompt eval state
     std::string input_prefix      = "";  // string to prefix user inputs with
     std::string input_suffix      = "";  // string to suffix user inputs with
+    std::string allowed_regex     = "";  // regex string used to force prediction of matching tokens
+    std::string bias_regex        = "";  // matching tokens are biased by bias_regex_value
+    float bias_regex_value        = 0;  // value to bias tokens matching bias_regex by
     std::vector<std::string> antiprompt; // string upon seeing which more user input is prompted
 
     std::string lora_adapter = "";  // lora adapter path
diff --git a/examples/main/main.cpp b/examples/main/main.cpp
index bd1c4ab558521..77e8e62072d43 100644
--- a/examples/main/main.cpp
+++ b/examples/main/main.cpp
@@ -18,6 +18,10 @@
 #include <string>
 #include <vector>
 
+#if defined(LLAMA_USE_BOOST)
+    #include <boost/regex.hpp>
+#endif
+
 #if defined (__unix__) || (defined (__APPLE__) && defined (__MACH__))
 #include <signal.h>
 #include <unistd.h>
@@ -97,6 +101,12 @@ int main(int argc, char ** argv) {
         params.prompt = gpt_random_prompt(rng);
     }
 
+
+#if defined(LLAMA_USE_BOOST)
+    boost::regex response_allowed_regex = boost::regex(params.allowed_regex);
+    boost::regex response_bias_regex = boost::regex(params.bias_regex);
+#endif
+
 //    params.prompt = R"(// this function checks if the number n is prime
 //bool is_prime(int n) {)";
 
@@ -305,7 +315,7 @@ int main(int argc, char ** argv) {
     console_set_color(con_st, CONSOLE_COLOR_PROMPT);
 
     std::vector<llama_token> embd;
-
+    std::string partial_completion;
     while (n_remain != 0 || params.interactive) {
         // predict
         if (embd.size() > 0) {
@@ -410,6 +420,17 @@ int main(int argc, char ** argv) {
                 for (auto it = params.logit_bias.begin(); it != params.logit_bias.end(); it++) {
                     logits[it->first] += it->second;
                 }
+#if defined(LLAMA_USE_BOOST)
+                if (params.allowed_regex != "" || params.bias_regex != "") {
+                    for (size_t i = 0; i < llama_n_vocab(ctx); i++) {
+                        if (!boost::regex_match(partial_completion + llama_token_to_str(ctx, i), response_allowed_regex, boost::match_partial))
+                            logits[i] = -INFINITY;
+                        else if (boost::regex_match(partial_completion + llama_token_to_str(ctx, i), response_bias_regex, boost::match_partial)) {
+                            logits[i] += params.bias_regex_value;
+                        }
+                    }
+                }
+#endif
 
                 std::vector<llama_token_data> candidates;
                 candidates.reserve(n_vocab);
@@ -459,6 +480,7 @@ int main(int argc, char ** argv) {
 
                 last_n_tokens.erase(last_n_tokens.begin());
                 last_n_tokens.push_back(id);
+                partial_completion += llama_token_to_str(ctx, id);
             }
 
             // replace end of text token with newline token when in interactive mode
@@ -481,6 +503,7 @@ int main(int argc, char ** argv) {
             --n_remain;
         } else {
             // some user input remains from prompt or interaction, forward it to processing
+            partial_completion = "";
             while ((int) embd_inp.size() > n_consumed) {
                 embd.push_back(embd_inp[n_consumed]);
                 last_n_tokens.erase(last_n_tokens.begin());