An object including a few helpful functions for debugging. Functions displaying popups or alerts are limited to a certain number of consecutive times before asking to continue, in case they end up being called in an endless loop or something.

(Supported by JavaScript, maybe other languages)

Functions for validating, parsing, and normalizing URIs and their parts.
If you find any errors, please leave a comment.

parseURI(str) splits a URI into its parts
parseQueryNumeric(str) splits a query string into its name/value pairs; returns a 2-D array
parseQueryAssociative(str) splits a query string into its name/value pairs; returns an associative array
parseURL(str) splits a URL (i.e., http(s) scheme URI) into its parts
normalizeURLDomain(domain) converts an obscured URL domain to a more readable one
normalizeIPv4(ip) normalizes an IPv4 address
normalizeIPv6(ip) normalizes an IPv6 address
normalizeURLPath(path) converts an obscured URL path to a more readable one
parseMailto(str) splits a mailto scheme URI into its parts
normalizeEmailAddress(str) converts an obscured email address to a more readable one; unfolds and removes comments
fixURL(str, domain) attempts to fix a URL if needed
fixHyperlink(str, domain, allowMailto) attempts to fix a hyperlink address (http(s) or mailto) if needed

For URLs, note that IPvFuture addresses are not supported.

In JSTL and EL, there is not floor, round, or ceiling function. Here is some relatively uncomplex ways to achieve the same effect.

This is the perfect regular expression for extracting a pair of html tags. For details, please seeThe regular expression for selecting a pair of HTML tag

Prints Hello world on console

Use this script gain baidu.com's emails.