diff --git a/config.toml b/config.toml
index 28adf29..89c9f74 100644
--- a/config.toml
+++ b/config.toml
@@ -58,3 +58,35 @@ commands = [
     #   fi
     #   ''' },
 ]
+
+# A list of regex replacements which are applied to branch names to determine
+# directory names.
+#
+# By default, when you create a worktree for a branch with a `/` in it, `git
+# prole` will use the last component of the name; e.g., `git prole add
+# -b puppy/doggy` creates a directory named `doggy` for a new branch
+# `puppy/doggy`.
+#
+# However, this might not be the most convenient behavior for you, so you can
+# substitute this behavior with a series of regex replacements instead.
+#
+# For example, my ticket tracker at work auto-generates branch names like
+# `rebeccat/team-1234-some-ticket-title-which-is-way-too-long`. With
+# configuration like this:
+#
+#     [[branch_replacements]]
+#     find = '''\w+/\w{1,4}-\d{1,5}-(\w+(?:-\w+){0,2}).*'''
+#     replace = '''$1'''
+#
+# `git prole add -b ...` will create a directory named `some-ticket-title`.
+# (The branch name will still be unchanged and way too long.)
+#
+# For completeness, you can also specify how many replacements are performed:
+#
+#     [[branch_replacements]]
+#     find = '''puppy'''
+#     replace = '''doggy'''
+#     count = 1
+#
+# See: https://docs.rs/regex/latest/regex/#syntax
+branch_replacements = []
diff --git a/src/add.rs b/src/add.rs
index e1e3d8a..d8eba23 100644
--- a/src/add.rs
+++ b/src/add.rs
@@ -11,11 +11,11 @@ use miette::Context;
 use miette::IntoDiagnostic;
 use owo_colors::OwoColorize;
 use owo_colors::Stream;
-use tap::Tap;
 use tracing::instrument;
 
 use crate::app_git::AppGit;
 use crate::cli::AddArgs;
+use crate::final_component;
 use crate::format_bulleted_list::format_bulleted_list;
 use crate::git::BranchRef;
 use crate::git::GitLike;
@@ -87,9 +87,7 @@ impl<'a> WorktreePlan<'a> {
                         .into_diagnostic()?
                 } else {
                     // Test case: `add_by_name_new_local`.
-                    git.worktree()
-                        .container()?
-                        .tap_mut(|p| p.push(name_or_path))
+                    git.worktree().path_for(name_or_path)?
                 }
             }
             None => {
@@ -368,7 +366,9 @@ impl BranchStartPointPlan {
                         .name_or_path
                         .as_deref()
                         .expect("If `--branch` is not given, `NAME_OR_PATH` must be given");
-                    let dirname = git.worktree().dirname_for(name_or_path);
+                    // TODO: It would be nice if there was a set of regexes for the
+                    // branch name itself, as well.
+                    let dirname = final_component(name_or_path);
 
                     match &args.commitish {
                         Some(commitish) => match Self::from_commitish(git, commitish)? {
diff --git a/src/config.rs b/src/config.rs
index 06b1450..2dfb65e 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -4,6 +4,7 @@ use camino::Utf8PathBuf;
 use clap::Parser;
 use miette::Context;
 use miette::IntoDiagnostic;
+use regex::Regex;
 use serde::de::Error;
 use serde::Deserialize;
 use unindent::unindent;
@@ -87,22 +88,19 @@ fn config_file_path(dirs: &BaseDirectories) -> miette::Result<Utf8PathBuf> {
 /// Each configuration key should have two test cases:
 /// - `config_{key}` for setting the value.
 /// - `config_{key}_default` for the default value.
+///
+/// For documentation, see the default configuration file (`../config.toml`).
+///
+/// The default configuration file is accessible as [`Config::DEFAULT`].
 #[derive(Debug, Default, Deserialize, PartialEq, Eq)]
+#[serde(default)]
 pub struct ConfigFile {
-    #[serde(default)]
     remotes: Vec<String>,
-
-    #[serde(default)]
     default_branches: Vec<String>,
-
-    #[serde(default)]
     copy_untracked: Option<bool>,
-
-    #[serde(default)]
     enable_gh: Option<bool>,
-
-    #[serde(default)]
     commands: Vec<ShellCommand>,
+    branch_replacements: Vec<BranchReplacement>,
 }
 
 impl ConfigFile {
@@ -134,8 +132,12 @@ impl ConfigFile {
         self.enable_gh.unwrap_or(false)
     }
 
-    pub fn commands(&self) -> Vec<ShellCommand> {
-        self.commands.clone()
+    pub fn commands(&self) -> &[ShellCommand] {
+        &self.commands
+    }
+
+    pub fn branch_replacements(&self) -> &[BranchReplacement] {
+        &self.branch_replacements
     }
 }
 
@@ -194,6 +196,30 @@ impl<'de> Deserialize<'de> for ShellArgs {
     }
 }
 
+#[derive(Clone, Debug, Deserialize)]
+pub struct BranchReplacement {
+    #[serde(deserialize_with = "deserialize_regex")]
+    pub find: Regex,
+    pub replace: String,
+    pub count: Option<usize>,
+}
+
+impl PartialEq for BranchReplacement {
+    fn eq(&self, other: &Self) -> bool {
+        self.replace == other.replace && self.find.as_str() == other.find.as_str()
+    }
+}
+
+impl Eq for BranchReplacement {}
+
+fn deserialize_regex<'de, D>(deserializer: D) -> Result<Regex, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    let input: String = Deserialize::deserialize(deserializer)?;
+    Regex::new(&input).map_err(D::Error::custom)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -201,14 +227,37 @@ mod tests {
 
     #[test]
     fn test_default_config_file_parse() {
+        let default_config = toml::from_str::<ConfigFile>(Config::DEFAULT).unwrap();
         assert_eq!(
-            toml::from_str::<ConfigFile>(Config::DEFAULT).unwrap(),
+            default_config,
             ConfigFile {
                 remotes: vec!["upstream".to_owned(), "origin".to_owned(),],
                 default_branches: vec!["main".to_owned(), "master".to_owned(), "trunk".to_owned(),],
                 copy_untracked: Some(true),
                 enable_gh: Some(false),
                 commands: vec![],
+                branch_replacements: vec![],
+            }
+        );
+
+        let empty_config = toml::from_str::<ConfigFile>("").unwrap();
+        assert_eq!(
+            default_config,
+            ConfigFile {
+                remotes: empty_config.remotes(),
+                default_branches: empty_config.default_branches(),
+                copy_untracked: Some(empty_config.copy_untracked()),
+                enable_gh: Some(empty_config.enable_gh()),
+                commands: empty_config
+                    .commands()
+                    .iter()
+                    .map(|command| command.to_owned())
+                    .collect(),
+                branch_replacements: empty_config
+                    .branch_replacements()
+                    .iter()
+                    .map(|replacement| replacement.to_owned())
+                    .collect()
             }
         );
     }
diff --git a/src/convert.rs b/src/convert.rs
index 52621e3..0cfdee1 100644
--- a/src/convert.rs
+++ b/src/convert.rs
@@ -257,7 +257,7 @@ where
             let name = git
                 .worktree()
                 .dirname_for(default_branch.branch_name())
-                .to_owned();
+                .into_owned();
 
             // If we're creating a worktree for a default branch from a
             // remote, we may not have a corresponding local branch
diff --git a/src/final_component.rs b/src/final_component.rs
new file mode 100644
index 0000000..28a82fa
--- /dev/null
+++ b/src/final_component.rs
@@ -0,0 +1,7 @@
+/// Get the final component of a path-like value.
+pub fn final_component(path_ish: &str) -> &str {
+    match path_ish.rsplit_once('/') {
+        Some((_left, right)) => right,
+        None => path_ish,
+    }
+}
diff --git a/src/git/worktree/mod.rs b/src/git/worktree/mod.rs
index 88b91ce..cef6068 100644
--- a/src/git/worktree/mod.rs
+++ b/src/git/worktree/mod.rs
@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::ffi::OsStr;
 use std::fmt::Debug;
 use std::process::Command;
@@ -13,6 +14,8 @@ use tap::Tap;
 use tracing::instrument;
 use utf8_command::Utf8Output;
 
+use crate::config::BranchReplacement;
+use crate::final_component;
 use crate::AppGit;
 
 use super::BranchRef;
@@ -251,12 +254,25 @@ where
     ///
     /// E.g. to convert a repo `~/puppy` with default branch `main`, this will return `main`,
     /// to indicate a worktree to be placed in `~/puppy/main`.
-    ///
-    /// TODO: Should support some configurable regex filtering or other logic?
-    pub fn dirname_for<'b>(&self, branch: &'b str) -> &'b str {
-        match branch.rsplit_once('/') {
-            Some((_left, right)) => right,
-            None => branch,
+    pub fn dirname_for<'b>(&self, branch: &'b str) -> Cow<'b, str> {
+        let branch_replacements = self.0.config.file.branch_replacements();
+        if branch_replacements.is_empty() {
+            Cow::Borrowed(final_component(branch))
+        } else {
+            let mut dirname = branch.to_owned();
+            for BranchReplacement {
+                find,
+                replace,
+                count,
+            } in branch_replacements
+            {
+                dirname = match count {
+                    Some(count) => find.replacen(&dirname, *count, replace),
+                    None => find.replace_all(&dirname, replace),
+                }
+                .into_owned();
+            }
+            dirname.into()
         }
     }
 
@@ -267,7 +283,7 @@ where
     pub fn path_for(&self, branch: &str) -> miette::Result<Utf8PathBuf> {
         Ok(self
             .container()?
-            .tap_mut(|p| p.push(self.dirname_for(branch))))
+            .tap_mut(|p| p.push(&*self.dirname_for(branch))))
     }
 
     /// Resolves a set of worktrees into a map from worktree paths to unique names.
diff --git a/src/lib.rs b/src/lib.rs
index 2a2e488..2d1c59d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,7 @@ mod config;
 mod convert;
 mod copy_dir;
 mod current_dir;
+mod final_component;
 mod format_bulleted_list;
 pub mod fs;
 mod gh;
@@ -29,6 +30,7 @@ mod utf8tempdir;
 pub use app::App;
 pub use app_git::AppGit;
 pub use config::Config;
+pub use final_component::final_component;
 pub use format_bulleted_list::format_bulleted_list;
 pub use format_bulleted_list::format_bulleted_list_multiline;
 pub use git::repository_url_destination;
diff --git a/test-harness/src/repo_state.rs b/test-harness/src/repo_state.rs
index aa88508..33e5580 100644
--- a/test-harness/src/repo_state.rs
+++ b/test-harness/src/repo_state.rs
@@ -83,14 +83,21 @@ impl RepoState {
             let mut expected_worktrees = worktrees
                 .iter()
                 .map(|worktree| {
-                    (
-                        self.root()
-                            .join(&worktree.path)
-                            .canonicalize_utf8()
-                            .map_err(|err| format!("{err}: {}", worktree.path))
-                            .expect("Worktree path should be canonicalize-able"),
-                        worktree,
-                    )
+                    let path = self.root().join(&worktree.path);
+
+                    if !path.exists() {
+                        panic!(
+                            "Worktree {} doesn't exist. Worktrees:\n{}",
+                            worktree.path, actual_worktrees
+                        );
+                    }
+
+                    let path = path
+                        .canonicalize_utf8()
+                        .map_err(|err| format!("{err}: {}", worktree.path))
+                        .expect("Worktree path should be canonicalize-able");
+
+                    (path, worktree)
                 })
                 .collect::<FxHashMap<_, _>>();
 
diff --git a/tests/config_branch_replacements.rs b/tests/config_branch_replacements.rs
new file mode 100644
index 0000000..d78b459
--- /dev/null
+++ b/tests/config_branch_replacements.rs
@@ -0,0 +1,39 @@
+use command_error::CommandExt;
+use test_harness::GitProle;
+use test_harness::WorktreeState;
+
+#[test]
+fn config_branch_replacements() -> miette::Result<()> {
+    let prole = GitProle::new()?;
+    prole.setup_worktree_repo("my-repo")?;
+    prole.write_config(
+        r#"
+        [[branch_replacements]]
+        find = '''\w+/\w{1,4}-\d{1,5}-(\w+(?:-\w+){0,2}).*'''
+        replace = '''$1'''
+        "#,
+    )?;
+
+    prole
+        .cd_cmd("my-repo/main")
+        .args([
+            "add",
+            "-b",
+            "doggy/pup-1234-my-cool-feature-with-very-very-very-long-name",
+        ])
+        .status_checked()
+        .unwrap();
+
+    prole
+        .repo_state("my-repo")
+        .worktrees([
+            WorktreeState::new_bare(),
+            WorktreeState::new("main").branch("main"),
+            WorktreeState::new("my-cool-feature")
+                .branch("doggy/pup-1234-my-cool-feature-with-very-very-very-long-name")
+                .upstream("main"),
+        ])
+        .assert();
+
+    Ok(())
+}
diff --git a/tests/config_branch_replacements_add_by_name.rs b/tests/config_branch_replacements_add_by_name.rs
new file mode 100644
index 0000000..b93dc18
--- /dev/null
+++ b/tests/config_branch_replacements_add_by_name.rs
@@ -0,0 +1,39 @@
+use command_error::CommandExt;
+use test_harness::GitProle;
+use test_harness::WorktreeState;
+
+#[test]
+fn config_branch_replacements_multiple() -> miette::Result<()> {
+    let prole = GitProle::new()?;
+    prole.setup_worktree_repo("my-repo")?;
+    prole.write_config(
+        r#"
+        [[branch_replacements]]
+        find = '''puppy'''
+        replace = '''doggy'''
+
+        [[branch_replacements]]
+        find = '''doggy'''
+        replace = '''cutie'''
+        "#,
+    )?;
+
+    prole
+        .cd_cmd("my-repo/main")
+        .args(["add", "silly-puppy"])
+        .status_checked()
+        .unwrap();
+
+    prole
+        .repo_state("my-repo")
+        .worktrees([
+            WorktreeState::new_bare(),
+            WorktreeState::new("main").branch("main"),
+            WorktreeState::new("silly-cutie")
+                .branch("silly-puppy")
+                .upstream("main"),
+        ])
+        .assert();
+
+    Ok(())
+}
diff --git a/tests/config_branch_replacements_count.rs b/tests/config_branch_replacements_count.rs
new file mode 100644
index 0000000..931e869
--- /dev/null
+++ b/tests/config_branch_replacements_count.rs
@@ -0,0 +1,36 @@
+use command_error::CommandExt;
+use test_harness::GitProle;
+use test_harness::WorktreeState;
+
+#[test]
+fn config_branch_replacements_count() -> miette::Result<()> {
+    let prole = GitProle::new()?;
+    prole.setup_worktree_repo("my-repo")?;
+    prole.write_config(
+        r#"
+        [[branch_replacements]]
+        find = '''puppy'''
+        replace = '''doggy'''
+        count = 1
+        "#,
+    )?;
+
+    prole
+        .cd_cmd("my-repo/main")
+        .args(["add", "-b", "puppypuppypuppy"])
+        .status_checked()
+        .unwrap();
+
+    prole
+        .repo_state("my-repo")
+        .worktrees([
+            WorktreeState::new_bare(),
+            WorktreeState::new("main").branch("main"),
+            WorktreeState::new("doggypuppypuppy")
+                .branch("puppypuppypuppy")
+                .upstream("main"),
+        ])
+        .assert();
+
+    Ok(())
+}
diff --git a/tests/config_branch_replacements_default.rs b/tests/config_branch_replacements_default.rs
new file mode 100644
index 0000000..bc302be
--- /dev/null
+++ b/tests/config_branch_replacements_default.rs
@@ -0,0 +1,28 @@
+use command_error::CommandExt;
+use test_harness::GitProle;
+use test_harness::WorktreeState;
+
+#[test]
+fn config_branch_replacements_default() -> miette::Result<()> {
+    let prole = GitProle::new()?;
+    prole.setup_worktree_repo("my-repo")?;
+
+    prole
+        .cd_cmd("my-repo/main")
+        .args(["add", "-b", "doggy/puppy"])
+        .status_checked()
+        .unwrap();
+
+    prole
+        .repo_state("my-repo")
+        .worktrees([
+            WorktreeState::new_bare(),
+            WorktreeState::new("main").branch("main"),
+            WorktreeState::new("puppy")
+                .branch("doggy/puppy")
+                .upstream("main"),
+        ])
+        .assert();
+
+    Ok(())
+}
diff --git a/tests/config_branch_replacements_multiple.rs b/tests/config_branch_replacements_multiple.rs
new file mode 100644
index 0000000..f30faeb
--- /dev/null
+++ b/tests/config_branch_replacements_multiple.rs
@@ -0,0 +1,39 @@
+use command_error::CommandExt;
+use test_harness::GitProle;
+use test_harness::WorktreeState;
+
+#[test]
+fn config_branch_replacements_multiple() -> miette::Result<()> {
+    let prole = GitProle::new()?;
+    prole.setup_worktree_repo("my-repo")?;
+    prole.write_config(
+        r#"
+        [[branch_replacements]]
+        find = '''puppy'''
+        replace = '''doggy'''
+
+        [[branch_replacements]]
+        find = '''doggy'''
+        replace = '''cutie'''
+        "#,
+    )?;
+
+    prole
+        .cd_cmd("my-repo/main")
+        .args(["add", "-b", "silly-puppy"])
+        .status_checked()
+        .unwrap();
+
+    prole
+        .repo_state("my-repo")
+        .worktrees([
+            WorktreeState::new_bare(),
+            WorktreeState::new("main").branch("main"),
+            WorktreeState::new("silly-cutie")
+                .branch("silly-puppy")
+                .upstream("main"),
+        ])
+        .assert();
+
+    Ok(())
+}