Regular Expressions 101

1st Alternative^0+(\d)

^start of line

0+the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated at least once

Group 1(\d)

\da digit

2nd Alternative(\d)0+$

Group 2(\d)

\da digit

0+the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated at least once

$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

^0+(\d)|(\d)0+$

New

00001011100000
000
000000123
000000456000000000000
789000

$1$2