Regular Expressions 101

1st Alternative(^.*|\n\s*\S+)

Group 1(^.*|\n\s*\S+)

1st Alternative^.*

^start of string

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

2nd Alternative\n\s*\S+

\na line-feed (newline) character (ASCII 10)

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

\S+any non-whitespace character, repeated at least once

2nd Alternative\S+(?= .*\n)

\S+any non-whitespace character, repeated at least once

Positive Lookahead(?= .*\n)

the literal (32₁₀ / 40₈ / 20₁₆)

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

\na line-feed (newline) character (ASCII 10)

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(^.*|\n\s*\S+)|\S+(?= .*\n)

New

67  4 -8  5 13
 9 13 42  4 -7
 1  1  3 -9 29
16 99  8 77  0

67  4 -8  5 13
 9 13 42  4 -7
 1  1  3 -9 29
16 99  8 77  0