Regular Expressions 101

^start of line

Non-Capturing Group(?:export\s+|)

1st Alternativeexport\s+

exportthe literal text export (case sensitive)

\s+any whitespace character, repeated at least once

2nd Alternative — matches an empty string

Group key(?<key>[[:alnum:]_]+)

Character Class[[:alnum:]_]+

+matches at least one character from the set below:

[:alnum:]an alphanumeric character [a-zA-Z0-9]

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 2((?<quote>["'])?(?<val>.*?[^\\])\k<quote>?|)

1st Alternative(?<quote>["'])?(?<val>.*?[^\\])\k<quote>?

Group quote(?<quote>["'])?

?repeats the group contents below at most once:

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group val(?<val>.*?[^\\])

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

Negated Character Class[^\\]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\k<quote>?optionally matches the text saved by group quote

2nd Alternative — matches an empty string

$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

^(?:export\s+|)(?<key>[[:alnum:]_]+)=((?<quote>["'])?(?<val>.*?[^\\])\k<quote>?|)$

New

DOT_ENV=dotenv
#DOTENV=dotenv
DOT_ENV= asdf asf 
DOTENV='dot env'
DOTENV="dot env"
DOT_ENV='dotenv'
DOT_ENV="DotEnv"
DOTENV="Dot\nEnv"
DOTENV="{"Dot":"Env"}"
export DOTENV="dotenv"
DOTENV ="dot env"
DOTENV= "dot env"
DOTENV = "dot env"