Regular Expressions 101

Positive Lookbehind(?<=^|,|\s)

1st Alternative^

^start of line

2nd Alternative,

,the literal , (44₁₀ / 54₈ / 2C₁₆)

3rd Alternative\s

\sany whitespace character

Group 1(\d+)

\d+a digit, 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.

25 tokens

Regular Expression

(?<=^|,|\s)(\d+)

New

1,2,10, ,  222,, 999,1000

1,2,10, ,  222,, 999,1000