This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed
Format a list using regular expressions
This converter decodes URL-encoded string (percent-encoded characters). It converts reserved characters as well as UTF-8 characters
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.