Applying a regular expression to a Java I/O Stream [closed]

Answer 1

The needed functionality is not present on Java Standard. You will have to use jakarta regexp, and specifically, the StreamCharacterIterator class. This class encapsulates a InputStream for use in regexp operations.

If you want to use the standard regular expression package, I would suggest take a the source from the previous class here and change the contract by implementing CharSequence instead of CharacterIterator.

Answer 2

Regex operations must be performed on strings, which are encoded bytes of binary data. You can't perform regex operations on bytes of data you have no idea what they represent.

Answer 3

Convert the stream to a byte array.

Answer 4

Try to use Ragel - regular expression tool with transitions callbacks.

Can applied to streams and chunks.