You want that upgraded to an XHTML compatible attribute width='120px'. The "Find" part of a Find/Replace dialog is one simple example. Regular expressions are used for matching string patterns. If you've never used regex before, we won't teach you too much in this one short page, but we'll get you started with a basic use. One of the great features of programmer's editor Notepad++ is that it matches these old veterans' regex strengths without hiding them in a forest of cryptic commands. One of the features of the great old programming editors (with legendary Unix names like Vi and Emacs) was their ability to use regular expressions (aka regex) in search and replace operations.
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