Regular Expressions 101

Pro

Character Class[ \d]

the literal (32₁₀ / 40₈ / 20₁₆)

\da digit

Non-Capturing Group(?:(?<=[ ])[ ]|\d){7}

{7}repeats the group contents below exactly 7 times:

1st Alternative(?<=[ ])[ ]

Positive Lookbehind(?<=[ ])

Character Class[ ]

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[ ]

the literal (32₁₀ / 40₈ / 20₁₆)

2nd Alternative\d

\da digit

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

[ \d](?:(?<=[ ])[ ]|\d){7}\d

New

123456789
kfasdf  3456789asdf
a        1
                            << spaces
12345 789
1       9
a     678a

123456789
kfasdf  3456789asdf
a        1
                            << spaces
12345 789
1       9
a     678a