Regular Expressions 101

Group 1((?:(?(?=(e.g.|z.b.|Figs?\.|\d+\.\d))\2|[^.!?])+[.!?]))

Non-Capturing Group(?:(?(?=(e.g.|z.b.|Figs?\.|\d+\.\d))\2|[^.!?])+[.!?])

Condition(?(?=(e.g.|z.b.|Figs?\.|\d+\.\d))\2|[^.!?])+

+repeats the group contents below at least once:

Uses the first branch if the lookaround matches

Positive Lookahead(?=(e.g.|z.b.|Figs?\.|\d+\.\d))

Group 2(e.g.|z.b.|Figs?\.|\d+\.\d)

1st Alternativee.g.

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

.any character (except for line terminators)

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

.any character (except for line terminators)

2nd Alternativez.b.

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

.any character (except for line terminators)

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

.any character (except for line terminators)

3rd AlternativeFigs?\.

Figthe literal text Fig (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

4th Alternative\d+\.\d

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

If the condition is true, match this branch:\2

\2the text saved by group 2

Otherwise, match this branch:[^.!?]

Negated Character Class[^.!?]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Character Class[.!?]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

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.

Search reference

Regular Expression

((?:(?(?=(e.g.|z.b.|Figs?\.|\d+\.\d))\2|[^.!?])+[.!?]))

New

Test 10. Testing. Testing. Fig. 20. The decimal 20.3 should 20 still be sentence.Ok now. try 2.3. Explained reference to Figs. 2 and 3.