Regular Expressions 101

GigabitEthernet1the literal text GigabitEthernet1 (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Non-Capturing Group(?:(?!interface GigabitEthernet)[\s\S])*

*repeats the group contents below any number of times:

Negative Lookahead(?!interface GigabitEthernet)

interface GigabitEthernetthe literal text interface GigabitEthernet (case sensitive)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

Group 1(vlan.*40(?:9[12]|[6-8][0-9]|5[2-9]))

vlanthe literal text vlan (case sensitive)

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

40the literal text 40

Non-Capturing Group(?:9[12]|[6-8][0-9]|5[2-9])

1st Alternative9[12]

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

2nd Alternative[6-8][0-9]

Character Class[6-8]

6-8one character from 6 (54₁₀) to 8 (56₁₀)

Character Class[0-9]

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

3rd Alternative5[2-9]

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Character Class[2-9]

2-9one character from 2 (50₁₀) 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

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Search reference

Regular Expression

GigabitEthernet1\/1\/1(?:(?!interface GigabitEthernet)[\s\S])*(vlan.*40(?:9[12]|[6-8][0-9]|5[2-9]))

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