Regular Expressions 101

Group 1(.*?)

.*?any character (except for line terminators), repeated any number of times

Group with flags ig(?i:\bruby\b|willa)

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

1st Alternative\bruby\b

\ban ASCII word boundary

rubythe literal text ruby (case insensitive)

\ban ASCII word boundary

2nd Alternativewilla

willathe literal text willa (case insensitive)

Group 2(.*?)

.*?any character (except for line terminators), repeated any number of times

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(.*?)(?i:\bruby\b|willa)(.*?)

New

rubychannel

ruby
Ruby
RUBY
this is ruby
ruby is this
I love Ruby so very much
 - ruby video charter project powerful
 - video ruby charter project powerful
 - video charter ruby project powerful
 - video charter project ruby powerful
 - video charter project powerful ruby 
willa is awesome too
is willa awesome too
willa is awesome willa  too 
is willa awesome too willa

Regular Expression

Substitution