^start of line
/the literal / (4710 / 578 / 2F16)
Group 1(hunde|kleinanzeigen) hundethe literal text hunde (case sensitive) 2nd Alternativekleinanzeigen kleinanzeigenthe literal text kleinanzeigen (case sensitive) /the literal / (4710 / 578 / 2F16)
Negative Lookahead(?!.*/[a-z]+/) .*any Unicode character (except for line terminators), repeated any number of times
/the literal / (4710 / 578 / 2F16)
+matches at least one character from the set below:
a-zone character from a (9710) to z (12210) (case sensitive)
/the literal / (4710 / 578 / 2F16)
.*any Unicode character (except for line terminators), repeated any number of times
Group 2(prp_[a-z0-9_]+_\d+|cat_48_5030.*) 1st Alternativeprp_[a-z0-9_]+_\d+ prp_the literal text prp_ (case sensitive) Character Class[a-z0-9_]+ +matches at least one character from the set below:
a-zone character from a (9710) to z (12210) (case sensitive)
0-9one character from 0 (4810) to 9 (5710)
_the literal _ (9510 / 1378 / 5F16)
_the literal _ (9510 / 1378 / 5F16)
\d+a Unicode decimal digit, repeated at least once
2nd Alternativecat_48_5030.* cat_48_5030the literal text cat_48_5030 (case sensitive) .*any Unicode character (except for line terminators), repeated any number of times
\.the literal . (4610 / 568 / 2E16)
htmlthe literal text html (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