regex101: PCRE (Legacy) Match Workspace

Pro

(?i)applies the following effective flags to the remainder of the pattern: gmi

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

Positive Lookbehind(?<=[a-z]|\d)

1st Alternative[a-z]

Character Class[a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

2nd Alternative\d

\da digit

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Positive Lookahead(?=\d)

\da digit

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

25 tokens

Regular Expression

(?i)(?<=[a-z]|\d) +(?=\d)

New

Amber-Rose Bowen 53    123 Machinery Rd.
Joyce Kirkland 19 234 Cylinder Dr.
Seb Dotson 32 3456 Surgery Ln. 
Dominique Hough 58 654 Election Rd.
Yasemin Mcleod 29 555 Cabinet Ave.
Nancy Lord 80       232 Highway Rd.
Tracy Mckenzie 72 101 Device Ave.
Alistair Salter 25 109 Guitar Ln.
Adeel Sears 42 222 Solitare Rd.

Extraction

Amber-Rose Bowen 53    123 Machinery Rd.
Joyce Kirkland 19 234 Cylinder Dr.
Seb Dotson 32 3456 Surgery Ln. 
Dominique Hough 58 654 Election Rd.
Yasemin Mcleod 29 555 Cabinet Ave.
Nancy Lord 80       232 Highway Rd.
Tracy Mckenzie 72 101 Device Ave.
Alistair Salter 25 109 Guitar Ln.
Adeel Sears 42 222 Solitare Rd.