Regular Expressions 101

Negative Lookahead(?!.*[DFIOQU])

.*any character (except for line terminators), repeated any number of times

Character Class[DFIOQU]

Dthe literal D (68₁₀ / 104₈ / 44₁₆) (case sensitive)

Fthe literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive)

Ithe literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive)

Othe literal O (79₁₀ / 117₈ / 4F₁₆) (case sensitive)

Qthe literal Q (81₁₀ / 121₈ / 51₁₆) (case sensitive)

Uthe literal U (85₁₀ / 125₈ / 55₁₆) (case sensitive)

Character Class[A-VXY]

A-Vone character from A (65₁₀) to V (86₁₀) (case sensitive)

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

Ythe literal Y (89₁₀ / 131₈ / 59₁₆) (case sensitive)

Character Class[0-9]

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

Character Class[A-Z]

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

.?optionally matches any character (except for line terminators)

Character Class[0-9]

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

Character Class[A-Z]

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

Character Class[0-9]

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

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.

Search reference

Regular Expression

(?!.*[DFIOQU])[A-VXY][0-9][A-Z].?[0-9][A-Z][0-9]

New

Valid
123 4th Street, Toronto, Ontario, M1A 1A1
12456 Pine Way, Montreal, Quebec H9Z 9Z9
Invalid
123 4th Street, Toronto, Ontario, Q1A 1A1
12456 Pine Way, Montreal, Quebec H9Z-9Z9
56 Winding Way, Thunder Bay, Ontario, D56 4A3
34 Cliff Drive, Bishop's Falls, Newfoundland B7E 4T
123 4th Street, Toronto, Ontario, M1A 1Q1

Regular Expression

Substitution