Regular Expressions 101

\ba Unicode word boundary

Ciscothe literal text Cisco (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Group 1((?:(?!\bSoftware\b)[A-Za-z ])*)

Non-Capturing Group(?:(?!\bSoftware\b)[A-Za-z ])*

*repeats the group contents below any number of times:

Negative Lookahead(?!\bSoftware\b)

\ba Unicode word boundary

Softwarethe literal text Software (case sensitive)

\ba Unicode word boundary

Character Class[A-Za-z ]

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

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

the literal (32₁₀ / 40₈ / 20₁₆)

\sa Unicode whitespace character

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

Softwarethe literal text Software (case sensitive)

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

\bCisco\s+((?:(?!\bSoftware\b)[A-Za-z ])*)\s.*?Software

New

Cisco IOS XR Software, Version 5.3.4[Default]

Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)

Cisco Nexus Operating System (NX-OS) Software

Cisco IOS XE Software, Version 16.05.01b
Cisco IOS Software [Everest], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.5.1b, RELEASE SOFTWARE (fc1)

Regular Expression

Extraction