PHP/Regex: simple regex for bbcode [s] or [strike] fails to work
For a silly bbcode parser I wanted to add two definitions into one, my original definition was this for preg_replace:
'#[s](.*?)[/s]#si', '<strike>1</strike>'
And this works, I wished for the user to be able to use either [s] or [strike] to initiate text in that format, so I naturally added something like this thinking it would work:
'#[(s|strike)](.*?)[/(s|strike)]#si', '<strike>1</strike>'
Unfortunately that fails, instead of what you would expect, both [s] and [strike] (used properly) make: s and strike (my markdown is correct to show its real looking result, it shows s or strike regardless of what is inside it)
Why does it replace the inner text with the tag name instead? Is my adding parentheses around the s|strike the problem? I am probably doing this all wrong..
The problem is that you added two new regex groups, (s|strike) in the opening tag and (s|strike) in the closing tag. So inside your resulting code you will get s or strike . You can fix that by simply using the correct group number, 2 .
Another way would be to make that new groups non-referencing, by adding a ?: to the beginning, but I guess the first solution is easier to understand:
#[(?:s|strike)](.*?)[/(?:s|strike)]#si
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