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 Alternativespace

7th Alternativepgup

8th Alternativepgdn

9th Alternativeend

10th Alternativehome

11th Alternativeleft

12th Alternativeup

13th Alternativeright

14th Alternativedown

15th Alternativeinsert

16th Alternativedelete

17th Alternative(?<!shift.+)numpad_(?:[0-9]|period)

18th Alternativenumpad_(?:multiply|plus|minus|divide)

19th Alternativef[1-9]

20th Alternativef1[0-9]

21st Alternativef2[0-4]

22nd 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|space|pgup|pgdn|end|home|left|up|right|down|insert|delete|(?<!shift.+)numpad_(?:[0-9]|period)|numpad_(?:multiply|plus|minus|divide)|f[1-9]|f1[0-9]|f2[0-4]|plus)$

Unit Tests

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