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• LL1 grammar analysis. Yet another top-down parser generator.

  The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.

• GET request string parser

  This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed

• List format

  Format a list using regular expressions

• Regular expression tester

  This online calculator allows user to experiment with regular expressions.

• URL-encoded string decoder

  This converter decodes URL-encoded string (percent-encoded characters). It converts reserved characters as well as UTF-8 characters