regex101: JavaScript Match Workspace

^start of line

Group modifier(?<modifier>(ctrl|alt|shift)(?:\+(ctrl|alt|shift)(?<!\2))?(?:\+(ctrl|alt|shift)(?<!\2|\3))?\+)?

?repeats the group contents below at most once:

Group 2(ctrl|alt|shift)

1st Alternativectrl

ctrlthe literal text ctrl (case sensitive)

2nd Alternativealt

altthe literal text alt (case sensitive)

3rd Alternativeshift

shiftthe literal text shift (case sensitive)

Non-Capturing Group(?:\+(ctrl|alt|shift)(?<!\2))?

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Group 3(ctrl|alt|shift)

1st Alternativectrl

ctrlthe literal text ctrl (case sensitive)

2nd Alternativealt

altthe literal text alt (case sensitive)

3rd Alternativeshift

shiftthe literal text shift (case sensitive)

Negative Lookbehind(?<!\2)

\2the text saved by group 2

Non-Capturing Group(?:\+(ctrl|alt|shift)(?<!\2|\3))?

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Group 4(ctrl|alt|shift)

1st Alternativectrl

ctrlthe literal text ctrl (case sensitive)

2nd Alternativealt

altthe literal text alt (case sensitive)

3rd Alternativeshift

shiftthe literal text shift (case sensitive)

Negative Lookbehind(?<!\2|\3)

1st Alternative\2

\2the text saved by group 2

2nd Alternative\3

\3the text saved by group 3

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

1st Alternative[^\s+]

Negated Character Class[^\s+]

\sany whitespace character

+the literal + (43₁₀ / 53₈ / 2B₁₆)

2nd Alternativebackspace

backspacethe literal text backspace (case sensitive)

3rd Alternativetab

tabthe literal text tab (case sensitive)

4th Alternativeenter

enterthe literal text enter (case sensitive)

5th Alternativeesc

6th Alternativeescape

7th Alternativespace

8th Alternativepgup

9th Alternativepageup

10th Alternativepgdn

11th Alternativepagedown

12th Alternativeend

13th Alternativehome

14th Alternativeleft

15th Alternativeup

16th Alternativeright

17th Alternativedown

18th Alternativeinsert

19th Alternativedelete

20th Alternative(?<!shift.+)(?:numpad_?[0-9]|numpad_(?:period|decimal))

22nd Alternativef[1-9]

23rd Alternativef1[0-9]

24th Alternativef2[0-4]

25th Alternativeplus

$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

Search reference

Regular Expression

^(?<modifier>(ctrl|alt|shift)(?:\+(ctrl|alt|shift)(?<!\2))?(?:\+(ctrl|alt|shift)(?<!\2|\3))?\+)?(?<key>[^\s+]|backspace|tab|enter|esc|escape|space|pgup|pageup|pgdn|pagedown|end|home|left|up|right|down|insert|delete|(?<!shift.+)(?:numpad_?[0-9]|numpad_(?:period|decimal))|numpad_(?:multiply|plus|add|minus|subtract|divide)|f[1-9]|f1[0-9]|f2[0-4]|plus)$

New

# These should all be allowed:
shift+up
ctrl+alt+delete
shift+alt+ctrl+f2
ctrl+numpad_0
alt+f24
alt+pagedown
pageup
pgup
pgdn
up
alt+numpad_0
ctrl+numpad_0
ctrl+numpad6
shift+numpad_divide
Z
|
alt+|
.
numpad_0
ctrl+w
ctrl+shift+1
ctrl+tab
ctrl+shift+tab
ctrl+shift+down
ctrl+shift+pgup
alt+1
shift+ctrl+space
pageup
f12
numpad_plus
numpad_add
numpad_minus
numpad_subtract
numpad_period
numpad_decimal
numpad_divide
plus
tab
backspace
shift+enter

# These should NOT:
+
||
alt
shift + 1
ctrl
alt+
alt++
shift+alt
plus+shift
shiftalt+up
ctrl+ctrl+delete
ctrl+alt+alt+delete
+alt+down
alt++down
shift+alt+shift+up
shift+ctrl+numpad_1
ctrl+shift+numpad_2
ctrl+alt+shift+numpad_2
shift+numpad0
shift+numpad_period
shift+numpad_decimal
shift+whatever
shift+numpadperiod
numpad_div
tab+delete
numpad_
f0
f25
99

Regular Expressions 101

Regular Expression

Extraction