diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 764a6ce7..15898f53 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -128,9 +128,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - macos-version: "10.15"
+          - macos-version: "11.0"
             target: x86_64-apple-darwin
-            py-platform: macosx-10_15_x86_64
+            py-platform: macosx-11_0_x86_64
           - macos-version: "11.0"
             target: aarch64-apple-darwin
             py-platform: macosx-11_0_arm64
diff --git a/Cargo.toml b/Cargo.toml
index fb57d349..780874f8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,9 +13,9 @@ documentation  = "https://docs.rs/pyroscope"
 repository = "https://github.com/pyroscope-io/pyroscope-rs"
 readme = "README.md"
 autobins = false
-autoexamples = true 
-autotests = true 
-autobenches = true 
+autoexamples = true
+autotests = true
+autobenches = true
 
 [workspace]
 members = [
@@ -57,7 +57,6 @@ names = "0.13.0"
 reqwest = { version = "0.11", features = ["blocking", "rustls-tls-native-roots"]}
 url = "2.2.2"
 libc = "^0.2.124"
-regex = "1"
 
 [dev-dependencies]
 tokio = { version = "1.18", features = ["full"] }
diff --git a/pyroscope_ffi/ruby/ext/rbspy/Cargo.toml b/pyroscope_ffi/ruby/ext/rbspy/Cargo.toml
index 6207cb65..2f321dd3 100644
--- a/pyroscope_ffi/ruby/ext/rbspy/Cargo.toml
+++ b/pyroscope_ffi/ruby/ext/rbspy/Cargo.toml
@@ -14,7 +14,6 @@ pyroscope = { path = "../../../../" }
 pyroscope_rbspy = { path = "../../../../pyroscope_backends/pyroscope_rbspy" }
 ffikit = { path = "../../../ffikit" }
 pretty_env_logger = "0.4.0"
-regex = "1"
 
 [patch.crates-io]
 read-process-memory = {git = "https://github.com/omarabid/read-process-memory.git", branch = "0.1.4-fix"}
diff --git a/pyroscope_ffi/ruby/ext/rbspy/src/lib.rs b/pyroscope_ffi/ruby/ext/rbspy/src/lib.rs
index 9fb6817b..6f045a66 100644
--- a/pyroscope_ffi/ruby/ext/rbspy/src/lib.rs
+++ b/pyroscope_ffi/ruby/ext/rbspy/src/lib.rs
@@ -6,8 +6,12 @@ use std::collections::hash_map::DefaultHasher;
 use std::ffi::CStr;
 use std::hash::Hasher;
 use std::os::raw::c_char;
+use std::env;
 
 pub fn transform_report(report: Report) -> Report {
+    let cwd = env::current_dir().unwrap();
+    let cwd = cwd.to_str().unwrap_or("");
+
     let data = report
         .data
         .iter()
@@ -17,18 +21,41 @@ pub fn transform_report(report: Report) -> Report {
                 .iter()
                 .map(|frame| {
                     let frame = frame.to_owned();
-                    let regex = regex::Regex::new(r"(.+?/gems/|.+?/ruby/)").unwrap();
-                    let new_filename = Some(
-                        regex
-                            .replace_all(frame.filename.unwrap().as_str(), "")
-                            .to_string(),
-                    );
+                    let mut s = frame.filename.unwrap();
+                    match s.find(cwd) {
+                        Some(i) => {
+                            s = s[(i+cwd.len()+1)..].to_string();
+                        }
+                        None => {
+                            match s.find("/gems/") {
+                                Some(i) => {
+                                    s = s[(i+1)..].to_string();
+                                }
+                                None => {
+                                    match s.find("/ruby/") {
+                                        Some(i) => {
+                                            s = s[(i+6)..].to_string();
+                                            match s.find("/") {
+                                                Some(i) => {
+                                                    s = s[(i+1)..].to_string();
+                                                }
+                                                None => {
+                                                }
+                                            }
+                                        }
+                                        None => {
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
 
                     // something
                     StackFrame::new(
                         frame.module,
                         frame.name,
-                        new_filename,
+                        Some(s.to_string()),
                         frame.relative_path,
                         frame.absolute_path,
                         frame.line,
@@ -52,8 +79,8 @@ pub fn transform_report(report: Report) -> Report {
 #[no_mangle]
 pub extern "C" fn initialize_agent(
     application_name: *const c_char, server_address: *const c_char, auth_token: *const c_char,
-    directory_name: *const c_char, sample_rate: u32, detect_subprocesses: bool, on_cpu: bool,
-    report_pid: bool, report_thread_id: bool, tags: *const c_char,
+    sample_rate: u32, detect_subprocesses: bool, on_cpu: bool, report_pid: bool,
+    report_thread_id: bool, tags: *const c_char,
 ) -> bool {
     // Initialize FFIKit
     let recv = ffikit::initialize_ffi().unwrap();
@@ -73,11 +100,6 @@ pub extern "C" fn initialize_agent(
         .unwrap()
         .to_string();
 
-    let directory_name = unsafe { CStr::from_ptr(directory_name) }
-        .to_str()
-        .unwrap()
-        .to_string();
-
     let tags_string = unsafe { CStr::from_ptr(tags) }
         .to_str()
         .unwrap()
@@ -97,17 +119,9 @@ pub extern "C" fn initialize_agent(
     let tags = string_to_tags(tags_ref);
     let rbspy = rbspy_backend(rbspy_config);
 
-    let mut regex_pattern = String::from(r"");
-
-    if directory_name != String::from(".") {
-        regex_pattern.push_str(directory_name.as_str());
-        regex_pattern.push_str(r"/");
-    }
-
     let mut agent_builder = PyroscopeAgent::builder(server_address, application_name)
         .backend(rbspy)
         .func(transform_report)
-        .regex(regex::Regex::new(regex_pattern.as_str()).unwrap())
         .tags(tags);
 
     if auth_token != "" {
diff --git a/pyroscope_ffi/ruby/lib/pyroscope.rb b/pyroscope_ffi/ruby/lib/pyroscope.rb
index 8f8b0327..11929703 100644
--- a/pyroscope_ffi/ruby/lib/pyroscope.rb
+++ b/pyroscope_ffi/ruby/lib/pyroscope.rb
@@ -4,7 +4,7 @@ module Pyroscope
   module Rust
     extend FFI::Library
     ffi_lib File.expand_path(File.dirname(__FILE__)) + "/rbspy/rbspy.#{RbConfig::CONFIG["DLEXT"]}"
-    attach_function :initialize_agent, [:string, :string, :string, :string, :int, :bool, :bool, :bool, :bool, :string], :bool
+    attach_function :initialize_agent, [:string, :string, :string, :int, :bool, :bool, :bool, :bool, :string], :bool
     attach_function :add_thread_tag, [:uint64, :string, :string], :bool
     attach_function :remove_thread_tag, [:uint64, :string, :string], :bool
     attach_function :add_global_tag, [:string, :string], :bool
@@ -18,12 +18,11 @@ module Utils
     attach_function :thread_id, [], :uint64
   end
 
-  Config = Struct.new(:application_name, :app_name, :server_address, :auth_token, :directory_name, :sample_rate, :detect_subprocesses, :on_cpu, :report_pid, :report_thread_id, :log_level, :tags) do
+  Config = Struct.new(:application_name, :app_name, :server_address, :auth_token, :sample_rate, :detect_subprocesses, :on_cpu, :report_pid, :report_thread_id, :log_level, :tags) do
     def initialize(*)
       self.application_name = ''
       self.server_address = 'http://localhost:4040'
       self.auth_token = ''
-      self.directory_name = File.dirname($0)
       self.sample_rate = 100
       self.detect_subprocesses = false
       self.on_cpu = true
@@ -46,7 +45,6 @@ def configure
         @config.app_name || @config.application_name || "",
         @config.server_address || "",
         @config.auth_token || "",
-        @config.directory_name || File.dirname($0),
         @config.sample_rate || 100,
         @config.detect_subprocesses || false,
         @config.on_cpu || false,
diff --git a/src/pyroscope.rs b/src/pyroscope.rs
index dc083070..08127a42 100644
--- a/src/pyroscope.rs
+++ b/src/pyroscope.rs
@@ -1,4 +1,3 @@
-use regex::Regex;
 use std::{
     collections::HashMap,
     marker::PhantomData,
@@ -43,8 +42,6 @@ pub struct PyroscopeConfig {
     pub spy_name: String,
     /// Authentication Token
     pub auth_token: Option<String>,
-    /// Regex to apply
-    pub regex: Option<Regex>,
     /// Function to apply
     pub func: Option<fn(Report) -> Report>,
 }
@@ -61,7 +58,6 @@ impl Default for PyroscopeConfig {
             sample_rate: 100u32,
             spy_name: "undefined".to_string(),
             auth_token: None,
-            regex: None,
             func: None,
         }
     }
@@ -83,7 +79,6 @@ impl PyroscopeConfig {
             sample_rate: 100u32,          // Default sample rate
             spy_name: String::from("undefined"), // Spy Name should be set by the backend
             auth_token: None,             // No authentication token
-            regex: None,                  // No regex
             func: None,                   // No function
         }
     }
@@ -125,14 +120,6 @@ impl PyroscopeConfig {
         }
     }
 
-    /// Set the Regex.
-    pub fn regex(self, regex: Regex) -> Self {
-        Self {
-            regex: Some(regex),
-            ..self
-        }
-    }
-
     /// Set the Function.
     pub fn func(self, func: fn(Report) -> Report) -> Self {
         Self {
@@ -268,22 +255,6 @@ impl PyroscopeAgentBuilder {
         }
     }
 
-    /// Set Regex.
-    /// This is optional. If not set, the agent will not apply any regex.
-    /// #Example
-    /// ```ignore
-    /// let builder = PyroscopeAgentBuilder::new("http://localhost:8080", "my-app")
-    /// .regex(Regex::new("^my-app.*").unwrap())
-    /// .build()
-    /// ?;
-    /// ```
-    pub fn regex(self, regex: Regex) -> Self {
-        Self {
-            config: self.config.regex(regex),
-            ..self
-        }
-    }
-
     /// Set the Function.
     /// This is optional. If not set, the agent will not apply any function.
     /// #Example
diff --git a/src/session.rs b/src/session.rs
index c9022ba6..cea971a2 100644
--- a/src/session.rs
+++ b/src/session.rs
@@ -159,13 +159,7 @@ impl Session {
         }
 
         // Convert a report to a byte array
-        let mut report_string = report_owned.to_string();
-
-        // Apply Regex to the report
-        if let Some(regex) = self.config.regex.clone() {
-            report_string = regex.replace_all(&report_string, "").to_string();
-        }
-
+        let report_string = report_owned.to_string();
         let report_u8 = report_string.into_bytes();
 
         // Check if the report is empty