REGEX capture each n-letters words between two words of a sentence

You may use this regex with a lookahead and \G:


RegEx Demo

RegEx Details:

  • (?:\bSTART\b|(?!^)\G): Match word START or starting from end of previous match match 0 or more words separated by 1+ whitespace.
  • \G: asserts position at the end of the previous match or the start of the string for the first match
  • \h+(?!END\b).*?(\w{4,}): Match 1+ whitespace followed 0 or more characters followed by a word of 4+ length which is captured in group #1
  • (?=.*?\bEND\b): Lookahead to assert presence of word END ahead

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