LeandroAntunes39 opened a new pull request, #751:
URL: https://github.com/apache/commons-text/pull/751
Fixes TEXT-178.
This change fixes the handling of escaped variable expressions that start
with a nested variable prefix but do not contain a matching outer suffix.
Before this change, `$${${a}` was processed in a way that allowed the inner
`${a}` expression to be resolved after the escape character was removed,
producing `${1`.
The expected behavior is to keep the expression as `${${a}`, because the
escaped outer expression should be treated as a whole and the inner prefix
should not be processed independently in this incomplete boundary pattern.
The change preserves the existing behavior for complete escaped nested
expressions such as `$${${a}}`, which still resolves to `${1}`, and for
standard escaped expressions such as `$${animal}`, which still resolves to
`${animal}`.
Added/enabled regression coverage in `StringSubstitutorTest`.
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