Regular Expressions 101

^start of line

Positive Lookahead(?=.*"key1"\s*:)

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

"key1"the literal text "key1" (case sensitive)

\s*a Unicode whitespace character, repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Positive Lookahead(?=.*"key2"\s*:)

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

"key2"the literal text "key2" (case sensitive)

\s*a Unicode whitespace character, repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Positive Lookahead(?=.*"key3"\s*:)

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

"key3"the literal text "key3" (case sensitive)

\s*a Unicode whitespace character, repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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

$end of line

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.

Search reference

Regular Expression

^(?=.*"key1"\s*:)(?=.*"key2"\s*:)(?=.*"key3"\s*:).*$

New

{ "key1": "some id", "key2": "some id", "key3": "some id", "key4": "irrelevant" }
{ "key1": "some id", "key2": "some id", "key5": "some id", "key4": "irrelevant" }
{ "key1": "some id", "key2": "some id", "key5": "some id", "key3": "irrelevant" }
{ "key1"  : "some id", "key2" : "some id", "key5": "some id", "key3"  : "irrelevant" }

Regular Expression

Extraction