Regular Expressions 101

^start of line

Non-Capturing Group(?:(?:56|78)-[0-9]+|[0-9]{2,})

1st Alternative(?:56|78)-[0-9]+

Non-Capturing Group(?:56|78)

1st Alternative56

56the literal text 56

2nd Alternative78

78the literal text 78

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

2nd Alternative[0-9]{2,}

Character Class[0-9]{2,}

{2,}matches at least 2 characters from the set below:

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

$end of line

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

^(?:(?:56|78)-[0-9]+|[0-9]{2,})$

New

Valid matches:
minimun two characters and only numbers OR
only numbers with dash in third position and first two numbers should be either 56 or 78. So if there is dash then there should be 56 or 78 next to it

12
123456789
423432423423423423423432
56-1
56-23456789
78-12
78-34234234234234234234234
Invalid matches:

1
1-
11-
1-112
44-2342424
64-4345334
55-sdrfewrwe
56-
5678-234324123423154

Regular Expression

Substitution