Regular Expressions 101

Pro

1st Alternative^(?:\s*(0)+\s*$|[\s0]+)

^start of line

Non-Capturing Group(?:\s*(0)+\s*$|[\s0]+)

1st Alternative\s*(0)+\s*$

\s*any whitespace character, repeated any number of times

Group 1(0)+

+repeats the group contents below at least once:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\s*any whitespace character, repeated any number of times

$end of line

2nd Alternative[\s0]+

Character Class[\s0]+

+matches at least one character from the set below:

\sany whitespace character

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative\s+$

\s+any whitespace character, 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.

25 tokens

^(?:\s*(0)+\s*$|[\s0]+)|\s+$

New

$1