Regular Expressions 101

Group command(?P<command>RENAME_SECTION)

RENAME_SECTIONthe literal text RENAME_SECTION (case sensitive)

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

Group file(?P<file>\S+)

\S+any character that is not Unicode whitespace, repeated at least once

::the literal text ::

Group section(?P<section>\S+)

\S+any character that is not Unicode whitespace, repeated at least once

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

Non-Capturing Group(?:(?P<target_file>[^\s:]+)::)?

?repeats the group contents below at most once:

Group target_file(?P<target_file>[^\s:]+)

Negated Character Class[^\s:]+

+matches at least one character outside the set below:

\sa Unicode whitespace character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

::the literal text ::

Group target_section(?P<target_section>\S+)

\S+any character that is not Unicode whitespace, repeated at least once

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.

25 tokens

Regular Expression

(?P<command>RENAME_SECTION)\s+(?P<file>\S+)::(?P<section>\S+)\s+(?:(?P<target_file>[^\s:]+)::)?(?P<target_section>\S+)

New

RENAME_SECTION io.cfg::BUS1 io.cfg::BUS3
RENAME_SECTION io.cfg::BUS2       io_new.cfg::BUS2
RENAME_SECTION io.cfg::VID VID1

RENAME_SECTION io.cfg::BUS1 io.cfg::BUS3
RENAME_SECTION io.cfg::BUS2       io_new.cfg::BUS2
RENAME_SECTION io.cfg::VID VID1