Fix misleading pattern name and documentation (#109)

* Add better typing for slugify.slugify

Currently, mypy understands the type as `Iterable[str]`, which doesn't match what should actually be passed in, which is `Iterable[Iterable[str]]` or, ideally, `Iterable[Tuple[str, str]]`

* whitespace around =

* fix misleading pattern name and documentation

* fix README.md and cli doc as well

Co-authored-by: Fahrzin Hemmati <fahhem@users.noreply.github.com>
Co-authored-by: Val Neekman (AvidCoder) <un33kvu@gmail.com>

3 files changed, 8 insertions, 11 deletions

diff --git a/README.md b/README.md
index af10080..11e20da 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ def slugify(
   :param save_order (bool): if parameter is True and max_length > 0 return whole words in the initial order
   :param separator (str): separator between words
   :param stopwords (iterable): words to discount
-  :param regex_pattern (str): regex pattern for allowed characters
+  :param regex_pattern (str): regex pattern for disallowed characters
   :param lowercase (bool): activate case sensitivity by setting it to False
   :param replacements (iterable): list of replacement rules e.g. [['|', 'or'], ['%', 'percent']]
   :return (str): slugify text
diff --git a/slugify/__main__.py b/slugify/__main__.py
index ffdfd5f..5a888fe 100644
--- a/slugify/__main__.py
+++ b/slugify/__main__.py
@@ -31,7 +31,7 @@ def parse_args(argv):
     parser.add_argument("--stopwords", nargs='+',
                         help="Words to discount")
     parser.add_argument("--regex-pattern",
-                        help="Python regex pattern for allowed characters")
+                        help="Python regex pattern for disallowed characters")
     parser.add_argument("--no-lowercase", action='store_false', dest='lowercase', default=True,
                         help="Activate case sensitivity")
     parser.add_argument("--replacements", nargs='+',
diff --git a/slugify/slugify.py b/slugify/slugify.py
index f38df10..190ea92 100644
--- a/slugify/slugify.py
+++ b/slugify/slugify.py
@@ -1,6 +1,7 @@
 import re
-import unicodedata
 import sys
+import typing
+import unicodedata
 from html.entities import name2codepoint
 
 try:
@@ -15,8 +16,7 @@ CHAR_ENTITY_PATTERN = re.compile(r'&(%s);' % '|'.join(name2codepoint))
 DECIMAL_PATTERN = re.compile(r'&#(\d+);')
 HEX_PATTERN = re.compile(r'&#x([\da-fA-F]+);')
 QUOTE_PATTERN = re.compile(r'[\']+')
-ALLOWED_CHARS_PATTERN = re.compile(r'[^-a-z0-9]+')
-ALLOWED_CHARS_PATTERN_WITH_UPPERCASE = re.compile(r'[^-a-zA-Z0-9]+')
+DISALLOWED_CHARS_PATTERN = re.compile(r'[^-a-zA-Z0-9]+')
 DUPLICATE_DASH_PATTERN = re.compile(r'-{2,}')
 NUMBERS_PATTERN = re.compile(r'(?<=\d),(?=\d)')
 DEFAULT_SEPARATOR = '-'
@@ -66,7 +66,7 @@ def smart_truncate(string, max_length=0, word_boundary=False, separator=' ', sav
 
 def slugify(text, entities=True, decimal=True, hexadecimal=True, max_length=0, word_boundary=False,
             separator=DEFAULT_SEPARATOR, save_order=False, stopwords=(), regex_pattern=None, lowercase=True,
-            replacements=()):
+            replacements: typing.Iterable[typing.Iterable[str]] = ()):
     """
     Make a slug from the given text.
     :param text (str): initial text
@@ -78,7 +78,7 @@ def slugify(text, entities=True, decimal=True, hexadecimal=True, max_length=0, w
     :param save_order (bool): if parameter is True and max_length > 0 return whole words in the initial order
     :param separator (str): separator between words
     :param stopwords (iterable): words to discount
-    :param regex_pattern (str): regex pattern for allowed characters
+    :param regex_pattern (str): regex pattern for disallowed characters
     :param lowercase (bool): activate case sensitivity by setting it to False
     :param replacements (iterable): list of replacement rules e.g. [['|', 'or'], ['%', 'percent']]
     :return (str):
@@ -137,10 +137,7 @@ def slugify(text, entities=True, decimal=True, hexadecimal=True, max_length=0, w
     text = NUMBERS_PATTERN.sub('', text)
 
     # replace all other unwanted characters
-    if lowercase:
-        pattern = regex_pattern or ALLOWED_CHARS_PATTERN
-    else:
-        pattern = regex_pattern or ALLOWED_CHARS_PATTERN_WITH_UPPERCASE
+    pattern = regex_pattern or DISALLOWED_CHARS_PATTERN
     text = re.sub(pattern, DEFAULT_SEPARATOR, text)
 
     # remove redundant