This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed
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.
This online calculator allows user to experiment with regular expressions.
This converter decodes URL-encoded string (percent-encoded characters). It converts reserved characters as well as UTF-8 characters