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Home/ Questions/Q 7015491
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T22:39:31+00:00 2026-05-27T22:39:31+00:00

On input I have a plain text (in my case typically it will be

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On input I have a plain text (in my case typically it will be HTML) and a “grammar specification” (some way for extracting data from plain text to structured data), then on output I need to have some structured data (JSON is fine but maybe there exists something better?)

Are there any libraries for this task? What are good approaches to specify “grammar spec”?
What are the best approaches for solving such problem?

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  1. Editorial Team
    Editorial Team
    2026-05-27T22:39:32+00:00Added an answer on May 27, 2026 at 10:39 pm

    Some tools for grammar based transformations:

    • TXL http://www.txl.ca/
    • Stratego/XT http://strategoxt.org/
    • ASF+SDF http://www.meta-environment.org/

    Addition:

    • FPP (http://jffp.sourceforge.net/) is a flat file parsing library in Java that can be useful
    • If the input file is only HTML, jsoup (http://jsoup.org/) is a Java HTML parser
    • So is http://htmlparser.sourceforge.net/ or http://mozillaparser.sourceforge.net/ or http://jericho.htmlparser.net/docs/index.html
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