do not warn on - in refs (#15920)

* do not warn on - in refs

* Update conans/model/recipe_ref.py

Co-authored-by: Rubén Rincón Blanco <git@rinconblanco.es>

---------

Co-authored-by: Rubén Rincón Blanco <git@rinconblanco.es>

conans/model/recipe_ref.py

@@ -149,8 +149,8 @@ def validate_ref(self, allow_uppercase=False):
         if self.channel and validation_pattern.match(self.channel) is None:
             raise ConanException(f"Invalid package channel '{self.channel}'")
 
-        # Warn if they use .+- in the name/user/channel, as it can be problematic for generators
-        pattern = re.compile(r'[.+-]')
+         # Warn if they use .+ in the name/user/channel, as it can be problematic for generators
+        pattern = re.compile(r'[.+]')
         if pattern.search(self.name):
             ConanOutput().warning(f"Name containing special chars is discouraged '{self.name}'")
         if self.user and pattern.search(self.user):

conans/test/integration/command/export/export_test.py

@@ -434,8 +434,8 @@ def test_warn_special_chars_refs():
     assert "WARN: Name containing special chars is discouraged 'pkg.name'" in c.out
     c.run("export . --name=name --version=0.1 --user=user+some")
     assert "WARN: User containing special chars is discouraged 'user+some'" in c.out
-    c.run("export . --name=pkg.name --version=0.1 --user=user --channel=channel-some")
-    assert "WARN: Channel containing special chars is discouraged 'channel-some'" in c.out
+    c.run("export . --name=pkg.name --version=0.1 --user=user --channel=channel+some")
+    assert "WARN: Channel containing special chars is discouraged 'channel+some'" in c.out
 
 
 def test_export_json():