Regular Expressions 101

Pro

Positive Lookbehind(?<=source:\s)

source:the literal text source: (case sensitive)

\sany whitespace character

\S+any non-whitespace character, repeated at least once

Non-Capturing Group(?:\s+\S+){3,7}

{3,7}repeats the group contents below between 3 and 7 times:

\s+any whitespace character, repeated at least once

\S+any non-whitespace character, repeated at least once

\ban ASCII word boundary

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?<=source:\s)\S+(?:\s+\S+){3,7}\b

New

source: from animal origin as Vitamin A / all-trans-Retinol: Fish in general, liver and dairy products;
source: Eggs, liver, certain fish species such as sardines, certain mushroom species such as shiitake
source: Leafy green vegetables such as spinach; egg yolks; liver