diff --git a/gitfeatures/core.py b/gitfeatures/core.py
index 1840b58..56f996a 100644
--- a/gitfeatures/core.py
+++ b/gitfeatures/core.py
@@ -8,6 +8,7 @@
 from six.moves import input
 
 master_branch = os.environ.get("GITFEATURES_MASTER_BRANCH", "master")
+seperator = os.environ.get("GITFEATURES_BRANCH_SEPERATOR", "_")
 repo = os.environ.get("GITFEATURES_REPO", "github")
 merge_strategy = os.environ.get("GITFEATURES_STRATEGY", "merge")
 
@@ -16,7 +17,14 @@ def _call(args):
     try:
         return check_output(args).decode("utf-8")
     except CalledProcessError:
-        sys.exit(__name__ + ": none zero exit status executing: " + " ".join(args))  # noqa
+        sys.exit(
+            __name__ + ": none zero exit status executing: " + " ".join(args)
+        )  # noqa
+
+
+def _get_branch_name(prefix, name):
+    name = f"{prefix}{seperator}{name}"
+    return name
 
 
 def new_feature(name, prefix):
@@ -33,10 +41,12 @@ def new_feature(name, prefix):
             sys.exit("Ok, Exiting")  # noqa
 
     _call(["git", "remote", "update", "origin"])
-    new_branch = "%s_%s" % (prefix, name)
+    new_branch = _get_branch_name(prefix, name)
 
     if _branch_exists(new_branch):
-        sys.exit(__name__ + ": local or remote branch already exists: " + new_branch)  # noqa
+        sys.exit(
+            __name__ + ": local or remote branch already exists: " + new_branch
+        )  # noqa
 
     _call(["git", "checkout", "-b", new_branch])
     _call(["git", "push", "-u", "origin", new_branch + ":" + new_branch])
@@ -46,18 +56,22 @@ def finish_feature(name, prefix):
     cur_branch = _current_branch()
 
     if name:
-        branch = prefix + "_" + name
+        branch = _get_branch_name(prefix, name)
         if branch == cur_branch:
             _call(["git", "checkout", master_branch])
     elif cur_branch != master_branch:
         branch = cur_branch
         _call(["git", "checkout", master_branch])
     else:
-        sys.exit(__name__ + ": please provide a branch name if on {}".format(master_branch))
+        sys.exit(
+            __name__ + ": please provide a branch name if on {}".format(master_branch)
+        )
 
     _call(["git", "remote", "update", "origin"])
 
-    commits = _call(["git", "log", "--oneline", branch, "^origin/{}".format(master_branch)])
+    commits = _call(
+        ["git", "log", "--oneline", branch, "^origin/{}".format(master_branch)]
+    )
     if commits:
         sys.exit(
             __name__
@@ -75,14 +89,16 @@ def finish_feature(name, prefix):
 def _branch_func(branch_type, args):
     if len(args) > 0 and args[0] == "new":
         date = datetime.datetime.now()
-        new_branch = "{}_{}".format(branch_type, date.strftime("%Y%m%d"))
+        branch = _get_branch_name(branch_type, date.strftime("%Y%m%d"))
 
         _call(["git", "checkout", "-b", new_branch])
         _call(["git", "push", "-u", "origin", new_branch + ":" + new_branch])
 
         branches = _get_branches(branch_type)
         if len(branches) > 3:
-            print(f"you have more than 3 {branch_type} branches, shall I delete the eldest one? [y/n]")  # noqa
+            print(
+                f"you have more than 3 {branch_type} branches, shall I delete the eldest one? [y/n]"
+            )  # noqa
             if input().lower() == "y":
                 branch = branches[0]
                 _call(["git", "push", "origin", "--delete", branch])
@@ -116,10 +132,14 @@ def pullrequest(args):
 
     # check its up to date with remote master if not pull
     _call(["git", "remote", "update", "origin"])
-    commits = _call(["git", "log", "--oneline", "^" + branch, "origin/{}".format(master_branch)])
+    commits = _call(
+        ["git", "log", "--oneline", "^" + branch, "origin/{}".format(master_branch)]
+    )
     if commits:
         print(
-            "Your branch is behind origin/{} so cannot be automatically {}d.".format(merge_strategy, master_branch)
+            "Your branch is behind origin/{} so cannot be automatically {}d.".format(
+                merge_strategy, master_branch
+            )
         )  # noqa
         print(commits)
         print(
@@ -133,9 +153,15 @@ def pullrequest(args):
             _call(["git", "checkout", branch])
             try:
                 print("git {} {}".format(merge_strategy, master_branch))
-                output = check_output(["git", merge_strategy, master_branch]).decode("utf-8")
+                output = check_output(["git", merge_strategy, master_branch]).decode(
+                    "utf-8"
+                )
                 print(output)
-                print("Congratulations, successfully {}d {}".format(merge_strategy, master_branch))
+                print(
+                    "Congratulations, successfully {}d {}".format(
+                        merge_strategy, master_branch
+                    )
+                )
             except CalledProcessError as e:
                 if "CONFLICT" in e.output:
                     err = (
@@ -158,7 +184,9 @@ def pullrequest(args):
     origin = _call(["git", "config", "--get", "remote.origin.url"])
     name = origin.split(":")[1].replace(".git\n", "")
     url = _get_pullrequest_url(name, branch)
-    if (len(args) > 0 and args[0] == "--dry-run") or os.environ.get("CONSOLEONLY", False):  # noqa
+    if (len(args) > 0 and args[0] == "--dry-run") or os.environ.get(
+        "CONSOLEONLY", False
+    ):  # noqa
         print(url)
     else:
         webbrowser.open_new_tab(url)
@@ -169,7 +197,9 @@ def _get_pullrequest_url(name, branch):
     if repo == "github":
         url = "https://github.com/" + name + "/pull/new/" + branch
     elif repo == "bitbucket":
-        url = "https://bitbucket.org/" + name + "/pull-requests/new?t=1&source=" + branch  # noqa
+        url = (
+            "https://bitbucket.org/" + name + "/pull-requests/new?t=1&source=" + branch
+        )  # noqa
     return url