Regular Expressions 101

Explanation

Pro

\ba Unicode word boundary

Group 1(po\s+box\s*)

pothe literal text po (case sensitive)

\s+a Unicode whitespace character, repeated at least once

boxthe literal text box (case sensitive)

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

Group 2(\d+(?:\s+\d+)+)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:\s+\d+)+

+repeats the group contents below at least once:

\s+a Unicode whitespace character, repeated at least once

\d+a Unicode decimal 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

\b(po\s+box\s*)(\d+(?:\s+\d+)+)

New

po box 12 34 5 heisenburg 902 rr 15
po box 12 59 76
po box 56 56 barry 56 87
barry box 56 87

po box 12 34 5 heisenburg 902 rr 15
po box 12 59 76
po box 56 56 barry 56 87
barry box 56 87