Regular Expressions 101

Pro

^start of string

(?U)applies the following effective flags to the remainder of the pattern: uU

U modifier: Ungreedy. Quantifiers are lazy by default. A trailing ? makes a quantifier greedy

Group 1(.*(?:[aeiouyäöü])(?:[^aeiouyäöü]))

.*any Unicode character (except for line terminators), repeated any number of times

Non-Capturing Group(?:[aeiouyäöü])

Character Class[aeiouyäöü]

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

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

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

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

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

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

äthe literal ä (228₁₀ / 344₈ / E4₁₆) (case sensitive)

öthe literal ö (246₁₀ / 366₈ / F6₁₆) (case sensitive)

üthe literal ü (252₁₀ / 374₈ / FC₁₆) (case sensitive)

Non-Capturing Group(?:[^aeiouyäöü])

Negated Character Class[^aeiouyäöü]

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

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

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

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

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

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

äthe literal ä (228₁₀ / 344₈ / E4₁₆) (case sensitive)

öthe literal ö (246₁₀ / 366₈ / F6₁₆) (case sensitive)

üthe literal ü (252₁₀ / 374₈ / FC₁₆) (case sensitive)

(?X)applies the following effective flags to the remainder of the pattern: uUX

X modifier: eXtra. A \ followed by a letter with no special meaning causes an error

Group 2(.*)

.*any Unicode character (except for line terminators), repeated any number of times

$end of string, or before its final line terminator

Global pattern flags

u modifier: unicode. Treats the pattern and subject as UTF-16

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25 tokens

^(?U)(.*(?:[aeiouyäöü])(?:[^aeiouyäöü]))(?X)(.*)$

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