Build Your Own Database Driven Web Site Using PHP & MySQL by Kevin Yank

Author:Kevin Yank [Yank, Kevin]
Language: eng
Format: epub, mobi, pdf
ISBN: 9780980576818
Publisher: SitePoint Pty. Ltd.
Published: 2009-10-26T16:00:00+00:00

Notice that, because [ normally indicates the start of a set of acceptable characters in a regular expression, we put a backslash before it in order to remove its special meaning.

Similarly, we must escape the forward slash in the [/b] tag with a backslash, to prevent it from being mistaken for the delimiter that marks the end of the regular expression.

Without a matching [, the ] loses its special meaning, so it’s unnecessary to escape it, although you could put a backslash in front of it as well if you wanted to be thorough.

Also notice that, since we’re using the i modifier on each of the two regular expressions to make them case insensitive, both [B] and [b] (as well as [/B] and [/b]) will work as tags in our custom markup language.

Italic text can be achieved in the same way:

$text = preg_replace('/\[I]/i', '<em>', $text); $text = preg_replace('/\[\/I]/i', '</em>', $text);

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