Regular Expressions 101

Negative Lookbehind(?<!\d)

\da digit

Group 1(\d{5}(?:[-\s]\d{4})?)

\d{5}a digit, repeated exactly 5 times

Non-Capturing Group(?:[-\s]\d{4})?

?repeats the group contents below at most once:

Character Class[-\s]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

\d{4}a digit, repeated exactly 4 times

\ban ASCII word boundary

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<!\d)(\d{5}(?:[-\s]\d{4})?)\b

New

"Mr. Bean bought 2 tickets 2-613-213-4567",
  "43 Butter Rd, Brossard QC K0A 3P0 â€“ 613 213 4567", 
  "Rat Race, XX, 12345",
  "Ignore phone numbers(613)2134567",
  "Grab zips with dashes 12345-6789 or no space before12345-6789",  
  "Grab zips with spaces 12345 6789 or no space before12345 6789",
  "I like 1234567 dogs"