Regular Expressions 101

^start of line

Non-Capturing Group(?:\s*\d{8}\s*(?:,|$))+

+repeats the group contents below at least once:

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

\d{8}a digit, repeated exactly 8 times

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

Non-Capturing Group(?:,|$)

1st Alternative,

,the literal , (44₁₀ / 54₈ / 2C₁₆)

2nd Alternative$

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?:\s*\d{8}\s*(?:,|$))+$

12345678,23435678,23434422,23432423

12345678,12345