Fix from_format() with escaped elements

Author: sdispater

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Change Log
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed `from_format()` not recognizing input strings when the specified pattern had escaped elements.
+
+
 ## [2.0.3] - 2018-07-30
 
 ### Fixed

pendulum/formatting/formatter.py

@@ -626,6 +626,9 @@ def _replace_tokens(self, token, locale):  # type: (str, Locale) -> str
         if token.startswith("[") and token.endswith("]"):
             return token[1:-1]
         elif token.startswith("\\"):
+            if len(token) == 2 and token[1] in {"[", "]"}:
+                return ""
+
             return token
         elif token not in self._REGEX_TOKENS and token not in self._LOCALIZABLE_TOKENS:
             raise ValueError("Unsupported token: {}".format(token))

tests/datetime/test_from_format.py

@@ -31,6 +31,12 @@ def test_from_format_with_timezone():
     assert "Europe/London" == d.timezone_name
 
 
+def test_from_format_with_escaped_elements():
+    d = pendulum.from_format("1975-05-21T22:32:11+00:00", "YYYY-MM-DD[T]HH:mm:ssZ")
+    assert_datetime(d, 1975, 5, 21, 22, 32, 11)
+    assert "+00:00" == d.timezone_name
+
+
 def test_from_format_with_millis():
     d = pendulum.from_format("1975-05-21 22:32:11.123456", "YYYY-MM-DD HH:mm:ss.SSSSSS")
     assert_datetime(d, 1975, 5, 21, 22, 32, 11, 123456)