Regular Expressions 101

(?is)applies the following effective flags to the remainder of the pattern: gis

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

s modifier: single line. Allows a dot to match line terminators

Positive Lookbehind(?<=([a-z])\s)

Group 1([a-z])

Character Class[a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

\sany whitespace character

Group 2(\1)

\1the text saved by group 1

Group 3([a-z]*)

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?is)(?<=([a-z])\s)(\1)([a-z]*)

New

word dark king glow we end hello bye low wing
word Dark King Glow We End hello bye LoW wing
A a A b B C c C C

word dark king glow we end hello bye low wing
word Dark King Glow We End hello bye LoW wing
A a A b B C c C C