Regular Expressions 101

^start of line

Non-Capturing Group(?:.+\n)*

*repeats the group contents below any number of times:

.+any character (except for line terminators), repeated at least once

\na line-feed (newline) character (ASCII 10)

.*?any character (except for line terminators), repeated any number of times

\ban ASCII word boundary

catthe literal text cat (case sensitive)

\ban ASCII word boundary

.*any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:\n.+)*

*repeats the group contents below any number of times:

\na line-feed (newline) character (ASCII 10)

.+any character (except for line terminators), repeated at least once

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?:.+\n)*.*?\bcat\b.*(?:\n.+)*

New

Paragraph 1 wepfowfpo
fww efwf

Paragraph 2 wefwf32321
!@d r33tcat54, 333!..

Paragraph 3 4t4t022
-`121231ere3r3cat342232
$ 4t0g cat rdwd203  
$$333

Paragraph 4 222cocdo3