<the literal < (6010 / 748 / 3C16)
Negated Character Class[^\s]+ +matches at least one character outside the set below:
\sany whitespace character
.*?any character (except for line terminators), repeated any number of times
id="opensource"the literal text id="opensource" (case sensitive) .*?any character (except for line terminators), repeated any number of times
>the literal > (6210 / 768 / 3E16)
Non-Capturing Group(?:\s+)? ?repeats the group contents below at most once:
\s+any whitespace character, repeated at least once
.+?any character (except for line terminators), repeated at least once
Non-Capturing Group(?:\s+)? ?repeats the group contents below at most once:
\s+any whitespace character, repeated at least once
<the literal < (6010 / 748 / 3C16)
\/the literal / (4710 / 578 / 2F16)
\1the text saved by group 1
>the literal > (6210 / 768 / 3E16)
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string