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Add note about escaping backslash in pattern trait #1091

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Feb 14, 2022
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6 changes: 6 additions & 0 deletions docs/source/1.0/spec/core/constraint-traits.rst
Original file line number Diff line number Diff line change
Expand Up @@ -427,6 +427,12 @@ languages.
string matches the regular expression, whereas ``@pattern("^\\w+$")``
requires that the entire string matches the regular expression.

.. note::

Pattern values that contain ``\`` need to :ref:`escape it <string-escape-characters>`.
For example, the regular expression ``^\w+$`` would be specified as
``@pattern("^\\w+$")``.

.. tabs::

.. code-tab:: smithy
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