Regex one-to-one mapping pattern replace

Posted by polygenelubricants on Stack Overflow See other posts from Stack Overflow or by polygenelubricants
Published on 2010-03-15T07:18:07Z Indexed on 2010/03/15 7:19 UTC
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java

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regex

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string-manipulation

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search-and-replace

How would you use regex to write a function that replaces all lowercase letters with uppercase and vice versa?

Note: this is NOT a homework question. See also my previous explorations of regex:

Regex split into overlapping strings (Alan Moore's answer is especially instructive)
Can you use zero-width matching regex in String split? (my solution exploits a known Java regex bug with regards to non-obvious length lookbehind!)

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