# Package org.apache.commons.text.io

`StringSubstitutorReader` is a `Reader` that performs string substitution on a source `Reader` using a `StringSubstitutor`.

See: Description

- Class Summary
  Class | Description
  --- | ---
  StringSubstitutorReader | A `Reader` that performs string substitution on a source `Reader` using a `StringSubstitutor`.

## Package org.apache.commons.text.io Description

`StringSubstitutorReader` is a `Reader` that performs string substitution on a source `Reader` using a `StringSubstitutor`.

Using this Reader avoids reading a whole file into memory as a `String` to perform string substitution, for example, when a Servlet filters a file to a client.

Since:
  1.9

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