\ba Unicode word boundary
\w*a Unicode word character, repeated any number of times
housethe literal text house (case sensitive) \w*a Unicode word character, repeated any number of times
\ba Unicode word boundary
.*any Unicode character (except for line terminators), repeated any number of times
\.the literal . (4610 / 568 / 2E16)
Non-Capturing Group(?:jpg|png|gif) jpgthe literal text jpg (case sensitive) pngthe literal text png (case sensitive) gifthe literal text gif (case sensitive) $end of line
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