PHP preg_replace making regex optional?

A question mark after a token makes that token optional. Use (?...) to group several tokens (without creating a capturing group). Combining these, (?...)?

Makes the group optional. So you can do this: $content = preg_replace('#(?:)? '.

$image_tag. '(?:)? #i', "{$image_id}", $content); You might also want to look at alternative solutions that are not based on regular expressions, such as using an HTML parser.

Is there any reason $content = preg_replace('#'. $image_tag. '#i', "{$image_id}", $content); wouldn't work?

If you don't have the ^ and $ anchors on your regular expression, it should just search for $image_tag anywhere in the data whether or not it's surrounded by the tags. If that doesn't work, maybe try: $content = preg_replace('#()? '.

$image_tag. '()? #i', "{$image_id}", $content); which makes the and tags into subpatterns, followed by the?

Modifier (i.e. The subpattern may occur 0 or 1 times).

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