Regular Expressions 101

Explanation

Pro

1st Alternative(?<!\d)\.+(?=[A-Z.])

Negative Lookbehind(?<!\d)

\da Unicode decimal digit

\.+the literal . (46₁₀ / 56₈ / 2E₁₆) , repeated at least once

Positive Lookahead(?=[A-Z.])

Character Class[A-Z.]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative(?<=\d)\.+(?=[A-Z\d])

Positive Lookbehind(?<=\d)

\da Unicode decimal digit

\.+the literal . (46₁₀ / 56₈ / 2E₁₆) , repeated at least once

Positive Lookahead(?=[A-Z\d])

Character Class[A-Z\d]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\da Unicode decimal digit

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?<!\d)\.+(?=[A-Z.])|(?<=\d)\.+(?=[A-Z\d])

New

".A.B.C.D.E.F.G.H.I.J"
".K.Y.C.A.N.Y.W.H.I.A.W...1.B...1.1.7"
"Testing using quotes func "quot"."
A.b.e.f. testing test

".A.B.....C.D.E.F.G.H.I.J"
".K.Y.C.A.N.Y.W.H.I.A.W......1.B.......1....1.7"
"Testing using quotes func "quot"."
A.b.e.f. testing test

Extraction

".A.B.C.D.E.F.G.H.I.J"
".K.Y.C.A.N.Y.W.H.I.A.W...1.B...1.1.7"
"Testing using quotes func "quot"."
A.b.e.f. testing test

".A.B.....C.D.E.F.G.H.I.J"
".K.Y.C.A.N.Y.W.H.I.A.W......1.B.......1....1.7"
"Testing using quotes func "quot"."
A.b.e.f. testing test