<imgthe literal text <img (case insensitive) \s+any whitespace character, repeated at least once
src="the literal text src=" (case insensitive) .*?any character (except for line terminators), repeated any number of times
"the literal " (3410 / 428 / 2216)
\s+any whitespace character, repeated at least once
width="the literal text width=" (case insensitive) .*?any character (except for line terminators), repeated any number of times
"the literal " (3410 / 428 / 2216)
\s+any whitespace character, repeated at least once
height="the literal text height=" (case insensitive) .*?any character (except for line terminators), repeated any number of times
g modifier: global. Finds all matches instead of stopping after the first
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters