(?i)applies the following effective flags to the remainder of the pattern: gmi i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
Positive Lookbehind(?<=^|.) .any character (except for line terminators)
returned to athe literal text returned to a (case insensitive) \.the literal . (4610 / 568 / 2E16)
rthe literal r (11410 / 1628 / 7216) (case insensitive)
\.the literal . (4610 / 568 / 2E16)
ethe literal e (10110 / 1458 / 6516) (case insensitive)
\.the literal . (4610 / 568 / 2E16)
for the literal text for (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
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string