regex101: Python Match Workspace

Character Class[\r\n]

\ra carriage return (ASCII 13)

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

Group 1(# DO NOT TOUCH BEGIN[\n\r])?

?repeats the group contents below at most once:

# DO NOT TOUCH BEGINthe literal text # DO NOT TOUCH BEGIN (case sensitive)

Character Class[\n\r]

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

\ra carriage return (ASCII 13)

autothe literal text auto (case sensitive)

Character Class[ \t]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

vmbr10the literal text vmbr10 (case sensitive)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Character Class[\n\r]

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

\ra carriage return (ASCII 13)

Non-Capturing Group(?:[ \t]*.*[\n\r])*?

*?repeats the group contents below any number of times:

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

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

Character Class[\n\r]

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

\ra carriage return (ASCII 13)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

bridge_maxwaitthe literal text bridge_maxwait (case sensitive)

Character Class[ \t]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Group 2([\n\r]# DO NOT TOUCH END[\n\r])?

?repeats the group contents below at most once:

Character Class[\n\r]

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

\ra carriage return (ASCII 13)

# DO NOT TOUCH ENDthe literal text # DO NOT TOUCH END (case sensitive)

Character Class[\n\r]

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

\ra carriage return (ASCII 13)

Search reference

Regular Expression

[\r\n](# DO NOT TOUCH BEGIN[\n\r])?auto[ \t]+vmbr10[ \t]*[\n\r](?:[ \t]*.*[\n\r])*?[ \t]*bridge_maxwait[ \t]+0[ \t]*([\n\r]# DO NOT TOUCH END[\n\r])?

New

auto vmbr9
iface vmbr9 inet static
        address 10.109.0.2
        netmask 255.255.0.0
        bridge_ports none
        bridge_stp off
        bridge_fd 0
        bridge_maxwait 0

auto vmbr10
iface vmbr10 inet static
	up echo 1 > /sys/devices/virtual/net/vmbr10/bridge/multicast_snooping
	up echo 0 > /sys/class/net/vmbr10/bridge/multicast_querier
        address 10.111.0.2
        netmask 255.255.0.0
        bridge_ports none
        bridge_stp off
        bridge_fd 0
        bridge_maxwait 0
        post-up ip addr add 10.111.0.254/16 dev vmbr10

Regular Expressions 101

Regular Expression

Extraction