Use x option on regex so we can break it up for legibility.
PHP doesn't seem to let you concat multiple strings in a constant definition, which is kind of lame, so this seems to be the cleanest way to break it over lines. :P
# Constants needed for external link processing
# Everything except bracket, space, or control characters
const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
- const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)\\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/S';
+ const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
+ \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
// State constants for the definition list colon extraction
const COLON_STATE_TEXT = 0;