varthe literal text var (case sensitive) \s?optionally matches a Unicode whitespace character
_u='the literal text _u=' (case sensitive) .*any Unicode character (except for line terminators), repeated any number of times
';varthe literal text ';var (case sensitive) \s?optionally matches a Unicode whitespace character
_i='the literal text _i=' (case sensitive) \d+a Unicode decimal digit, repeated at least once
'the literal ' (3910 / 478 / 2716)
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