Regular Expressions 101

\ban ASCII word boundary

Non-Capturing Group(?:e(?!\w*e)|t(?!(?:\w*t){2})|a(?!\w*a))+

+repeats the group contents below at least once:

1st Alternativee(?!\w*e)

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

Negative Lookahead(?!\w*e)

\w*any word character, repeated any number of times

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

2nd Alternativet(?!(?:\w*t){2})

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

Negative Lookahead(?!(?:\w*t){2})

Non-Capturing Group(?:\w*t){2}

{2}repeats the group contents below exactly 2 times:

\w*any word character, repeated any number of times

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

3rd Alternativea(?!\w*a)

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

Negative Lookahead(?!\w*a)

\w*any word character, repeated any number of times

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

\ban ASCII word boundary

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\b(?:e(?!\w*e)|t(?!(?:\w*t){2})|a(?!\w*a))+\b

New

For example the following would work:

eat tea tate tt a e

The following would not work

eats teas tates ttt aa ee