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Here’s part 13 of the ongoing serialization of Refactoring HTML, also available from Amazon and Safari.

Regular expressions are well and good for individual, custom changes, but they can be tedious and difficult to use for large quantities of changes. In particular, they are designed more to work with plain text than with semistructured HTML text. For batch changes and automated corrections of common mistakes, it helps to have tools that take advantage of the markup in HTML. The first such tool is Dave Raggett’s Tidy (www.w3.org/People/Raggett/tidy/), the original HTML fixer-upper. It’s a simple, multiplatform command-line program that can correct most HTML mistakes.