Regular Expressions 101

Explanation
Pro

Group 1((?:\b\w+?\b\s*){0,3})

Non-Capturing Group(?:\b\w+?\b\s*){0,3}

{0,3}repeats the group contents below between 0 and 3 times:

\ban ASCII word boundary

\w+?any word character, repeated at least once

\ban ASCII word boundary

\s*any whitespace character, repeated any number of times

Character Class[dD]

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

Dthe literal D (68₁₀ / 104₈ / 44₁₆) (case sensitive)

atathe literal text ata (case sensitive)

Group 2((?:\s*\b\w+?\b){0,3})

Non-Capturing Group(?:\s*\b\w+?\b){0,3}

{0,3}repeats the group contents below between 0 and 3 times:

\s*any whitespace character, repeated any number of times

\ban ASCII word boundary

\w+?any word character, repeated at least once

\ban ASCII word boundary

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

((?:\b\w+?\b\s*){0,3})[dD]ata((?:\s*\b\w+?\b){0,3})

New

 Data is very important in in in  to use because data jfsdl fjdskjf  asdkfj adlfj... 
  test ets tets tet We value data since we need it ...

 Data is very important in in in  to use because data jfsdl fjdskjf  asdkfj adlfj... 
  test ets tets tet We value data since we need it ...