regex101: php $_REQUEST, $_POST, $

1st Alternative\s*(?=(\=(?!\=)))((?<!\=)\=)\s*\$_REQUEST\[.*\]

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

Positive Lookahead(?=(\=(?!\=)))

Group 1(\=(?!\=))

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negative Lookahead(?!\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 2((?<!\=)\=)

Negative Lookbehind(?<!\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

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

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

_REQUESTthe literal text _REQUEST (case insensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative\s*(?=(\=(?!\=)))((?<!\=)\=)\s*\$_POST\[.*\]

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

Positive Lookahead(?=(\=(?!\=)))

Group 3(\=(?!\=))

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negative Lookahead(?!\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 4((?<!\=)\=)

Negative Lookbehind(?<!\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

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

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

_POSTthe literal text _POST (case insensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

3rd Alternative\s*(?=(\=(?!\=)))((?<!\=)\=)\s*\$_REQUET\[.*\]

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

Positive Lookahead(?=(\=(?!\=)))

Group 5(\=(?!\=))

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negative Lookahead(?!\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 6((?<!\=)\=)

Negative Lookbehind(?<!\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

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

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

_REQUETthe literal text _REQUET (case insensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Search reference

Regular Expression

\s*(?=(\=(?!\=)))((?<!\=)\=)\s*\$_REQUEST\[.*\]|\s*(?=(\=(?!\=)))((?<!\=)\=)\s*\$_POST\[.*\]|\s*(?=(\=(?!\=)))((?<!\=)\=)\s*\$_REQUET\[.*\]

Test String
New

afrawefaew = $_REQUEST['foo']
sfvdfvsdfv=$_REQUEST['foo']
sdfvsdfv =$_REQUEST['barbar']
sdfvsdfv= $_REQUEST['baz']
sdfsdv == $_REQUEST['123sgrtrthrsh']

$_GET['foo']
$_GET['barbar']
$_get['baz']
$_POST['123sgrtrthrsh']
$_post['123sgrtrthrsh']

Regular Expression

Test StringNew

Test String
New