Regular Expressions 101

^start of line

Non-Capturing Group(?:(?P<Namespace>.+?)::)?

?repeats the group contents below at most once:

Group Namespace(?P<Namespace>.+?)

.+?any character (except for line terminators), repeated at least once

::the literal text ::

Group Group(?P<Group>[^.]+)

Negated Character Class[^.]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

.any character (except for line terminators)

Group Item(?P<Item>.+)

.+any character (except for line terminators), repeated at least once

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(?:(?P<Namespace>.+?)::)?(?P<Group>[^.]+).(?P<Item>.+)$

New

cache.levels.expensive.drivers
namespace::cache.levels.expensive.drivers
database.user
concrete.debug.display_errors
core::concrete.debug.display_errors

Regular Expression

Substitution