Regular Expressions 101

Pro

\ba Unicode word boundary

Group 1(yest(?:e(?:r(?:d(?:ay?)?)?)?)?|tod(?:ay?)?|tom(?:o(?:r(?:r(?:ow?)?)?)?)?)

1st Alternativeyest(?:e(?:r(?:d(?:ay?)?)?)?)?

yestthe literal text yest (case insensitive)

Non-Capturing Group(?:e(?:r(?:d(?:ay?)?)?)?)?

?repeats the group contents below at most once:

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

Non-Capturing Group(?:r(?:d(?:ay?)?)?)?

?repeats the group contents below at most once:

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

Non-Capturing Group(?:d(?:ay?)?)?

?repeats the group contents below at most once:

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

Non-Capturing Group(?:ay?)?

?repeats the group contents below at most once:

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

y?optionally matches the literal y (121₁₀ / 171₈ / 79₁₆) (case insensitive)

2nd Alternativetod(?:ay?)?

todthe literal text tod (case insensitive)

Non-Capturing Group(?:ay?)?

?repeats the group contents below at most once:

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

y?optionally matches the literal y (121₁₀ / 171₈ / 79₁₆) (case insensitive)

3rd Alternativetom(?:o(?:r(?:r(?:ow?)?)?)?)?

tomthe literal text tom (case insensitive)

Non-Capturing Group(?:o(?:r(?:r(?:ow?)?)?)?)?

?repeats the group contents below at most once:

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

Non-Capturing Group(?:r(?:r(?:ow?)?)?)?

?repeats the group contents below at most once:

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

Non-Capturing Group(?:r(?:ow?)?)?

?repeats the group contents below at most once:

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

Non-Capturing Group(?:ow?)?

?repeats the group contents below at most once:

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

w?optionally matches the literal w (119₁₀ / 167₈ / 77₁₆) (case insensitive)

\ba Unicode word boundary

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

\b(yest(?:e(?:r(?:d(?:ay?)?)?)?)?|tod(?:ay?)?|tom(?:o(?:r(?:r(?:ow?)?)?)?)?)\b

New

yest
yeste
yester
yesterd
yesterda
yesterday
tod
toda
today
tom
tomo
tomor
tomorr
tomorro
tomorrow

yesteray
tomorow
tommorrow
tody
yesteday

Substitution

yest
yeste
yester
yesterd
yesterda
yesterday
tod
toda
today
tom
tomo
tomor
tomorr
tomorro
tomorrow

yesteray
tomorow
tommorrow
tody
yesteday