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Editorial Team
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Asked: 2026-06-03T08:57:09+00:00

I’m new to the NIO classes; I’m working on some pattern matching with (possibly)

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I’m new to the NIO classes; I’m working on some pattern matching with (possibly) very large text files, and so far I’m reading data in from the file by mapping its channel to a byteBuffer, which is then converted to a charBuffer. My question is, with the charBuffer’s MapMode set to READ_WRITE, is there a way to directly modify the charBuffer as I am processing it, ala matcher.replaceAll()? Or do I need to loop through with matcher.find() and manually replace each instance of the pattern?

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1 Answer

  1. Editorial Team

    I would first just try reading in the entire file and do a find and replace and see if the performance is acceptable. If not, try to read in enough of the text to create a match and then do a replace on that portion of the text. Depending on the pattern/performance you may need to write a custom parser instead.

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