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Add a warning about routes parameters names limitations #7139

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4 changes: 4 additions & 0 deletions routing.rst
Original file line number Diff line number Diff line change
Expand Up @@ -466,6 +466,10 @@ a slash. URLs matching this route might look like:
Symfony provides you with a way to do this by leveraging service container
parameters. Read more about this in ":doc:`/routing/service_container_parameters`".

.. caution::

A route placeholder name cannot start with a digit and cannot be longer than 32 characters.

Special Routing Parameters
~~~~~~~~~~~~~~~~~~~~~~~~~~

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