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I decided to, for fun, make something similar to markdown. With my small experiences with Regular Expressions in the past, I know how extremely powerful they are, so they will be what I need.
So, if I have this string:
Hello **bold** world
How can I use preg_replace to convert that to:
Hello <b>bold</b> world
I assume something like this?
$input = "Hello **bold** world";
$output = preg_replace("/(\*\*).*?(\*\*/)", "<b></b>", $input);
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The preg_replace() function returns a string or array of strings where all matches of a pattern or list of patterns found in the input are replaced with substrings. There are three different ways to use this function: 1. One pattern and a replacement string.
str_replace replaces a specific occurrence of a string, for instance "foo" will only match and replace that: "foo". preg_replace will do regular expression matching, for instance "/f. {2}/" will match and replace "foo", but also "fey", "fir", "fox", "f12", etc.
(? i) makes the regex case insensitive. (? c) makes the regex case sensitive.
Word supports find/replace with it own variation of regular expressions (regex), which is called wildcards. To use regex: Ctrl-H (Find/Replace) ⇒ Check "Use wildcards" option under "More".
Close:
$input = "Hello **bold** world";
$output = preg_replace("/\*\*(.*?)\*\*/", "<b>$1</b>", $input);
I believe there is a PHP package for rendering Markdown. Rather than rolling your own, try using an existing set of code that's been written and tested.
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