diff --git a/.idea/runConfigurations/main.xml b/.idea/runConfigurations/main.xml
deleted file mode 100644
index 4231025..0000000
--- a/.idea/runConfigurations/main.xml
+++ /dev/null
@@ -1,24 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="main" type="PythonConfigurationType" factoryName="Python" nameIsGenerated="true">
-    <module name="py-regex-replace" />
-    <option name="INTERPRETER_OPTIONS" value="" />
-    <option name="PARENT_ENVS" value="true" />
-    <envs>
-      <env name="PYTHONUNBUFFERED" value="1" />
-    </envs>
-    <option name="SDK_HOME" value="$PROJECT_DIR$/venv/bin/python" />
-    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/src/py_regex_replace" />
-    <option name="IS_MODULE_SDK" value="false" />
-    <option name="ADD_CONTENT_ROOTS" value="true" />
-    <option name="ADD_SOURCE_ROOTS" value="true" />
-    <EXTENSION ID="PythonCoverageRunConfigurationExtension" runner="coverage.py" />
-    <option name="SCRIPT_NAME" value="$PROJECT_DIR$/src/py_regex_replace/main.py" />
-    <option name="PARAMETERS" value="-p ^Hi -r Hello -c 2" />
-    <option name="SHOW_COMMAND_LINE" value="false" />
-    <option name="EMULATE_TERMINAL" value="false" />
-    <option name="MODULE_MODE" value="false" />
-    <option name="REDIRECT_INPUT" value="true" />
-    <option name="INPUT_FILE" value="$PROJECT_DIR$/test/stdin.txt" />
-    <method v="2" />
-  </configuration>
-</component>
\ No newline at end of file
diff --git a/README.md b/README.md
index d01ff19..b69b6f1 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,42 @@
 # py-regex-replace
 
-perform regex-replacement on stdin and output result to stdout
+Perform regex-replacement on stdin and output result to stdout.
+
+## Usage
+
+```
+usage: py-regex-replace [-h] --pattern PATTERN --repl REPL [--count COUNT]
+
+options:
+  -h, --help            show this help message and exit
+  --pattern PATTERN, -p PATTERN
+                        regex search pattern
+  --repl REPL, -r REPL  replacement
+  --count COUNT, -c COUNT
+                        expected count of pattern in string. -1 allows any
+                        count
+```
+
+```
+usage: py-replace [-h] --text TEXT --repl REPL [--count COUNT]
+
+options:
+  -h, --help            show this help message and exit
+  --text TEXT, -t TEXT  text to replace
+  --repl REPL, -r REPL  replacement
+  --count COUNT, -c COUNT
+                        expected count of text in string. -1 allows any
+                        count
+```
+
+## Examples
+
+Some small example scripts can be found in [./test](./test). They can be run from inside the test directory:
+
+```shell
+cd test
+./test.sh
+```
 
 ## Installation
 
diff --git a/setup.cfg b/setup.cfg
index 47506f5..e556f16 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@
 
 [metadata]
 name = py-regex-replace
-version = 0.0.2
+version = 0.1.0
 author = Daniel Langbein
 author_email = daniel@systemli.org
 description = perform regex-replacement on stdin and output result to stdout
diff --git a/src/py_regex_replace/main.py b/src/py_regex_replace/main.py
index b553b36..5c73882 100755
--- a/src/py_regex_replace/main.py
+++ b/src/py_regex_replace/main.py
@@ -19,8 +19,9 @@ def main():
     # Return all non-overlapping matches of pattern in string, as a list of strings or tuples.
     # The string is scanned left-to-right, and matches are returned in order.
     matches = re.findall(pattern, string, flags=re.MULTILINE)
-    if len(matches) != count:
-        print(f'[ERROR] Expected {count} matches of pattern in string, but got {len(matches)}.')
+    if count != -1 and len(matches) != count:
+        print(f'[ERROR] Expected {count} matches of pattern in string, but got {len(matches)}.',
+              file=sys.stderr)
         exit(1)
 
     # https://docs.python.org/3/library/re.html#re.sub
@@ -41,14 +42,15 @@ def parse_args():
                         help='replacement',
                         required=True, type=str)
     parser.add_argument('--count', '-c',
-                        help='expected count of pattern in string',
+                        help='expected count of pattern in string. -1 allows any count',
                         default=1, type=int)
 
     args = parser.parse_args()
 
     string = sys.stdin.read()
     if len(string) == 0:
-        print('[WARNING] The given string is empty.', file=sys.stderr)
+        print('[WARNING] The given string is empty.',
+              file=sys.stderr)
 
     return args.pattern, args.repl, string, args.count
 
diff --git a/src/py_replace/main.py b/src/py_replace/main.py
index c557441..f4c0235 100755
--- a/src/py_replace/main.py
+++ b/src/py_replace/main.py
@@ -8,8 +8,9 @@ def main():
     text, repl, string, count = parse_args()
 
     occurrences = string.count(text)
-    if occurrences != count:
-        print(f'[ERROR] Expected {count} occurrences of text in string, but got {occurrences}.')
+    if count != -1 and occurrences != count:
+        print(f'[ERROR] Expected {count} occurrences of text in string, but got {occurrences}.',
+              file=sys.stderr)
         exit(1)
 
     string = string.replace(text, repl)
@@ -18,7 +19,7 @@ def main():
 
 
 def parse_args():
-    parser = argparse.ArgumentParser(prog='py-regex-replace')
+    parser = argparse.ArgumentParser(prog='py-replace')
 
     parser.add_argument('--text', '-t',
                         help='text to replace',
@@ -27,14 +28,15 @@ def parse_args():
                         help='replacement',
                         required=True, type=str)
     parser.add_argument('--count', '-c',
-                        help='expected count of text in string',
+                        help='expected count of text in string. -1 allows any count',
                         default=1, type=int)
 
     args = parser.parse_args()
 
     string = sys.stdin.read()
     if len(string) == 0:
-        print('[WARNING] The given string is empty.', file=sys.stderr)
+        print('[WARNING] The given string is empty.',
+              file=sys.stderr)
 
     return args.text, args.repl, string, args.count
 
diff --git a/test/test.sh b/test/test.sh
old mode 100644
new mode 100755
diff --git a/test/test_multiline_pattern.sh b/test/test_multiline_pattern.sh
old mode 100644
new mode 100755
diff --git a/test/test_multiline_replacement.sh b/test/test_multiline_replacement.sh
old mode 100644
new mode 100755