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Clarify pattern trait matching #649

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Dec 2, 2020
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Clarify pattern trait matching #649

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8 changes: 8 additions & 0 deletions docs/source/1.0/spec/core/constraint-traits.rst
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Expand Up @@ -406,6 +406,14 @@ conditionals, directives, recursion, lookahead, look-behind, back-references,
and look-around in order to ensure maximum compatibility across programming
languages.

.. important::

The ``pattern`` trait does not implicitly add a leading ``^`` or trailing
``$`` to match an entire string. For example, ``@pattern("\\w+")`` matches
both "hello" and "!hello!" because it requires that just part of the
string matches the regular expression, whereas ``@pattern("^\\w+$")``
requires that the entire string matches the regular expression.

.. tabs::

.. code-tab:: smithy
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