Require a separator when multiple specifiers are in a requirement.

mach_nix/requirements.py

@@ -97,7 +97,7 @@ def extras_from_marker(marker):
         return tuple(group[0] for group in matches)
     return tuple()
 
-
+re_spec_part = r"( *(==|!=|>=|<=|>|<|~=|=)? *(\* |dev|-?\w?\d(\w|\.|\*|-|\||!|\+)*))"
 re_reqs = re.compile(
     r"^(?P<name>([a-z]|[A-Z]|-|_|\d|\.)+)"
     rf"(?P<extras>\[({extra_name},?)+\])?"
@@ -110,7 +110,7 @@ re_reqs = re.compile(
             # multiple specs
             r" *\(?(?P<specs_0>"
                 r"\*"
-                r"|([,\|]? *(==|!=|>=|<=|>|<|~=|=)? *(\* |dev|-?\w?\d(\w|\.|\*|-|\||!|\+)*))+(?![_\d]))\)?"
+                rf"|{re_spec_part}([,\|]{re_spec_part})*(?![_\d]))\)?"
             r"(?P<build_0> *([a-z]|\d|_|\*|\.)+)?"
         r"|"
             # single spec only

mach_nix/tests/test_requirements.py

@@ -54,6 +54,7 @@ from mach_nix.requirements import parse_reqs_line
        ('zest.releaser', ('recommended', 'maintainer'), None, None, "extra == 'maintainer'"))
     , ('pytz (>dev)', ('pytz', (), ((('>', 'dev'),),), None, None))
     , ('libcurl 7.71.1 h20c2e04_1', ('libcurl', (), ((('==', '7.71.1'),),), 'h20c2e04_1', None))
+    , ('ixmp ==0.1.3 1', ('ixmp', (), ((('==', '0.1.3'),),), '1', None))
 ])
 def test_parse_requirements(input, exp_output):
     assert parse_reqs_line(input) == exp_output