Regular Expressions 101

Pro

\ban ASCII word boundary

Group 1([1-9](?:\s*[0-9]){3})

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Non-Capturing Group(?:\s*[0-9]){3}

{3}repeats the group contents below exactly 3 times:

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

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\s?optionally matches any whitespace character

Group 2([A-Z])

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Group with flags mgi(?i:\2*)

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

\2*the text saved by group 2, repeated any number of times

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

Group 3([A-Z])

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Group with flags mgi(?i:\3*)

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

\3*the text saved by group 3, repeated any number of times

\ban ASCII word boundary

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.

25 tokens

\b([1-9](?:\s*[0-9]){3})\s?([A-Z])(?i:\2*)\s*([A-Z])(?i:\3*)\b

New

1 2 3 4 Alpha Bravo
1234 Alpha Bravo
1234A Bbbbbbbc
1234Aaa Bbb
1234Aa Bbb
1234A BbbbBbbbb

$1$2$3

1 2 3 4 Alpha Bravo
1234 Alpha Bravo
1234A Bbbbbbbc
1234Aaa Bbb
1234Aa Bbb
1234A BbbbBbbbb