Regular Expressions 101

Pro

Non-Capturing Group(?:[,.;]?\s*y\s+|[,;]\s*)

1st Alternative[,.;]?\s*y\s+

Character Class[,.;]?

?matches at most one character from the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

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

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

\s+a Unicode whitespace character, repeated at least once

2nd Alternative[,;]\s*

Character Class[,;]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

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

Positive Lookahead(?=[A-Z]|l(?:[ao]s|a)|[eé]l)

1st Alternative[A-Z]

Character Class[A-Z]

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

2nd Alternativel(?:[ao]s|a)

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

Non-Capturing Group(?:[ao]s|a)

1st Alternative[ao]s

Character Class[ao]

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

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

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

2nd Alternativea

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

3rd Alternative[eé]l

Character Class[eé]

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

éthe literal é (233₁₀ / 351₈ / E9₁₆) (case sensitive)

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

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

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25 tokens

(?:[,.;]?\s*y\s+|[,;]\s*)(?=[A-Z]|l(?:[ao]s|a)|[eé]l)

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