regex101: PCRE (Legacy) Match Workspace

Comment:https://www.native-english.ru/grammar/english-nouns-plural

Negative Lookbehind(?<![a-z])

Character Class[a-z]

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

Comment:word boundary

1st Alternative [a-z]+ [bcdfghjklmnpqrtvwzeoya]s

Character Class[a-z]+

+matches at least one character from the set below:

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

Character Class[bcdfghjklmnpqrtvwzeoya]

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

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case insensitive)

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case insensitive)

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

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case insensitive)

jthe literal j (106₁₀ / 152₈ / 6A₁₆) (case insensitive)

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

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case insensitive)

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

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

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

qthe literal q (113₁₀ / 161₈ / 71₁₆) (case insensitive)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case insensitive)

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

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case insensitive)

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case insensitive)

zthe literal z (122₁₀ / 172₈ / 7A₁₆) (case insensitive)

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case insensitive)

othe literal o (111₁₀ / 157₈ / 6F₁₆) (case insensitive)

ythe literal y (121₁₀ / 171₈ / 79₁₆) (case insensitive)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

s the literal text s (case insensitive)

2nd Alternative [a-z]+ (?:[sc]h|[sxoiv])es

Character Class[a-z]+

+matches at least one character from the set below:

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

Non-Capturing Group(?:[sc]h|[sxoiv])

1st Alternative[sc]h

Character Class[sc]

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

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case insensitive)

2nd Alternative[sxoiv]

Character Class[sxoiv]

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

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case insensitive)

othe literal o (111₁₀ / 157₈ / 6F₁₆) (case insensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case insensitive)

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case insensitive)

es the literal text es (case insensitive)

3rd Alternative children

childrenthe literal text children (case insensitive)

4th Alternativemen

menthe literal text men (case insensitive)

5th Alternativewomen

womenthe literal text women (case insensitive)

6th Alternativemice

micethe literal text mice (case insensitive)

7th Alternativeteeth

teeththe literal text teeth (case insensitive)

8th Alternativefeet

feetthe literal text feet (case insensitive)

9th Alternativegeese

geesethe literal text geese (case insensitive)

10th Alternativeoxen

oxenthe literal text oxen (case insensitive)

11th Alternativedeer

deerthe literal text deer (case insensitive)

12th Alternativesheep

sheepthe literal text sheep (case insensitive)

13th Alternativeswine

swine the literal text swine (case insensitive)

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

s modifier: single line. Allows a dot to match line terminators

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

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

Search reference

Regular Expression

#https://www.native-english.ru/grammar/english-nouns-plural

(?<![a-z]) #word boundary
(?: [a-z]+ [bcdfghjklmnpqrtvwzeoya]s
  | [a-z]+ (?:[sc]h|[sxoiv])es
  | children|men|women|mice|teeth|feet|geese|oxen|deer|sheep|swine
)
$

Unit Tests

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