在PHP中的preg_match和preg_replace

Question

I have a task to find and replace words starting and ending with "#".

Example - my string will look like:

Put your hands up in the air for #performer1# , Put your hands up in the air for #event#.

What I expect as a output is:

Put your hands up in the air for #performer1# , Put your hands up in the air for #event# .

I have no idea about regular expressions in php, and I'm a beginner, can someone help?

Answer 1

As you already suggested, the preg_replace function should do the trick. What you now need is a regular expression like this

$string = "Put your hands up in the air for #performer#, ...";
$pattern = "/#(\w+)#/";
$replacement = '<strong>$1</strong>';
$new_string = preg_replace($pattern, $replacement, $string);

The magic bit is the $pattern variable where you specify what to look for. If you put parenthesis around something, you can reference the actual contents in the $replacement variable.

The \\w+ basically says: match as many characters as possible (and at least one) that are either az , AZ , 0-9 or _ .

The PHP PCRE Pattern Syntax can give you some more hints about how to use regular expressions.