Regular Expressions 101

^start of line

Character Class[A-Za-z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

\Ra newline sequence

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

Non-Capturing Group(?:[1-9]\R)+

+repeats the group contents below at least once:

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\Ra newline sequence

Positive Lookahead(?=0$)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

$end of line

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

^[A-Za-z].*\R\K(?:[1-9]\R)+(?=0$)

New

ABC
5
0
gdfgdfg
-----------
GHN
0
ffffffff
fffff
ffff
trte
-------------
H
1
0
----------------