Regular Expressions 101

Explanation

Pro

\Astart of string

Non-Capturing Group(?:(?!! NVRAM).*\n)*

*repeats the group contents below any number of times:

Negative Lookahead(?!! NVRAM)

! NVRAMthe literal text ! NVRAM (case sensitive)

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

\na line-feed (newline) character (ASCII 10)

! NVRAMthe literal text ! NVRAM (case sensitive)

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

\n*a line-feed (newline) character (ASCII 10), repeated any number of times

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

\A(?:(?!! NVRAM).*\n)*! NVRAM.*\n*

New

Building configuration...

Current configuration : 32546 bytes
!
! Last configuration change at 22:48:59 UTC Wed Jan 6 2021 by bobb
! NVRAM config last updated at 22:35:10 UTC Mon Nov 2 2020 by johns
!
version 16.10

Substitution

Building configuration...

Current configuration : 32546 bytes
!
! Last configuration change at 22:48:59 UTC Wed Jan 6 2021 by bobb
! NVRAM config last updated at 22:35:10 UTC Mon Nov 2 2020 by johns
!
version 16.10