Adds any character at the given index of a string.

NOTE: Count starts from 0

How Long Has It Been Since a Certain Date?

Java properties files can yield undesirable results at runtime, if there happen to be spaces at the end of some lines.

Requires a win32 port for the GNU utilities grep and sed - e.g. http://unxutils.sourceforge.net/.

Format Bytes

Convert an irregular name=value pair string into a formatted array.

Recursively delete a directory, emptying all contents.

If you have ever written a website or java application where people paste stuff in from Word, you are likely to have hit the problem of Word using high ascii chars for "open quotes", "close quotes", reg symbol, etc...

This java class (with a single static method) can replace the most prevalent of these with normal ascii values

Hope it helps someone...

Another solution recommends using a text match pattern.
This works, but as long as you've got mail.jar in your classpath anyway, you might as well use this technique instead. (Plus, I think it works with older JDK 1.2+, whereas pattern.compile is 1.4+)

Note that it also accepts a comma-separated list of emails, just like a To: or CC: address line would.

Similar to Perl's CGI::escapeHTML(), though (because we can!) this adds it as a method to all String objects.

Generate a random number or string in PHP.