Regular Expressions 101

Group 1((?:(?(?=Fig\.|\d+\.\d).+?(?=\s)|[^.!?])+(?=\.))+)

Non-Capturing Group(?:(?(?=Fig\.|\d+\.\d).+?(?=\s)|[^.!?])+(?=\.))+

+repeats the group contents below at least once:

Condition(?(?=Fig\.|\d+\.\d).+?(?=\s)|[^.!?])+

+repeats the group contents below at least once:

Uses the first branch if the lookaround matches

Positive Lookahead(?=Fig\.|\d+\.\d)

1st AlternativeFig\.

Figthe literal text Fig (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd 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:.+?(?=\s)

.+?any character (except for line terminators), repeated at least once

Positive Lookahead(?=\s)

\sany whitespace character

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

Negated Character Class[^.!?]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Positive Lookahead(?=\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

((?:(?(?=Fig\.|\d+\.\d).+?(?=\s)|[^.!?])+(?=\.))+)

New

This sentence should be captured because it contains the number 20. 

This sentence should be captured because it contains the reference term 20AA. 

This sentence should not be captured because it does not contain a number or reference term.

Regular Expression

Substitution