.*any character (except for line terminators), repeated any number of times
\ban ASCII word boundary
optthe literal text opt (case sensitive) 1the literal 1 (4910 / 618 / 3116)
2the literal 2 (5010 / 628 / 3216)
3the literal 3 (5110 / 638 / 3316)
\ban ASCII word boundary
\s*any whitespace character, repeated any number of times
.*?any character (except for line terminators), repeated any number of times
\s*any whitespace character, repeated any number of times
because_of_thisthe literal text because_of_this (case sensitive) \ban ASCII word boundary
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