Regular Expressions 101

Explanation

Pro

Positive Lookbehind(?<=[\s\b()-])

Character Class[\s\b()-]

\sa Unicode whitespace character

\ba backspace character (ASCII 8)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 1(\d+)

\d+a Unicode decimal digit, repeated at least once

Group 2(\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

Positive Lookahead(?=\s?[A-Za-z]?)

\s?optionally matches a Unicode whitespace character

Character Class[A-Za-z]?

?matches at most one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

Group 3((\s?[kmgtpun])?(i?b/?s?|s|hz)?)

Group 4(\s?[kmgtpun])?

?repeats the group contents below at most once:

\s?optionally matches a Unicode whitespace character

Character Class[kmgtpun]

kthe literal k (107₁₀ / 153₈ / 6B₁₆) (case insensitive)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case insensitive)

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case insensitive)

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case insensitive)

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case insensitive)

uthe literal u (117₁₀ / 165₈ / 75₁₆) (case insensitive)

nthe literal n (110₁₀ / 156₈ / 6E₁₆) (case insensitive)

Group 5(i?b/?s?|s|hz)?

?repeats the group contents below at most once:

1st Alternativei?b/?s?

i?optionally matches the literal i (105₁₀ / 151₈ / 69₁₆) (case insensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case insensitive)

/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

2nd Alternatives

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

3rd Alternativehz

hzthe literal text hz (case insensitive)

Positive Lookahead(?=[]\s\b()[]|$)

1st Alternative[]\s\b()[]

Character Class[]\s\b()[]

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\sa Unicode whitespace character

\ba backspace character (ASCII 8)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

2nd Alternative$

$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

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?<=[\s\b()-])(\d+)(\.\d+)?(?=\s?[A-Za-z]?)((\s?[kmgtpun])?(i?b/?s?|s|hz)?)(?=[]\s\b()[]|$)

 70 02  [95386.467810]=  50 MiB 28414 (1806 ms in 2 ms) in 5 ms 2.74GHz 434MHz 90kHz 23Hz  1.7k 2
ul 07  [2484867] 41666 KiB/s 29107  [17755556] 0s [  | 2.74 GHz 434 MHz 90 KHz 45 kHz 23 Hz  [143M  
 8317 (-70831 us) 10023ms ()-> 10022ms ( (37.9 kHz e)  0.389978] pci  4ns  1.4M  9986  [100k Sep-22]
 468G  163G  282G  3  511M  5.3M  506M   5.5T  4.3T  1.3T   1.2T   890M   236G -l 1.1T   17G  ) 3.4T  c 1.1T   1.7T  cinema 15G   software 446G  software 5.5T  total 29k x 4  4.1k 23-Sr 4.1k 2 r 4.1k 1  4.1k :38 5 ter 4.1k r 4.1k  st

23-Feb  "2022-09-21T00:49:08.191147376+03:00"p4*[m    2% /boot/efi
 @ 192.168.1.2 :/mnt/6Sep   (0) g  02:45:46 done 600 601 605 628 +h
00:48:22  [0m 0312./05 III (2020-2021)  1

Substitution

 70 02  [95386.467810]=  50 MiB 28414 (1806 ms in 2 ms) in 5 ms 2.74GHz 434MHz 90kHz 23Hz  1.7k 2
ul 07  [2484867] 41666 KiB/s 29107  [17755556] 0s [  | 2.74 GHz 434 MHz 90 KHz 45 kHz 23 Hz  [143M  
 8317 (-70831 us) 10023ms ()-> 10022ms ( (37.9 kHz e)  0.389978] pci  4ns  1.4M  9986  [100k Sep-22]
 468G  163G  282G  3  511M  5.3M  506M   5.5T  4.3T  1.3T   1.2T   890M   236G -l 1.1T   17G  ) 3.4T  c 1.1T   1.7T  cinema 15G   software 446G  software 5.5T  total 29k x 4  4.1k 23-Sr 4.1k 2 r 4.1k 1  4.1k :38 5 ter 4.1k r 4.1k  st

23-Feb  "2022-09-21T00:49:08.191147376+03:00"p4*[m    2% /boot/efi
 @ 192.168.1.2 :/mnt/6Sep   (0) g  02:45:46 done 600 601 605 628 +h
00:48:22  [0m 0312./05 III (2020-2021)  1