RegexpGarden

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let garden = "Rose\tRosemary\tRose\tRose\t

Primrose\tRosemary\tRosemary\t

Rose\tRose";

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garden = garden

.replace(//gi, "Blackberry");

Lesson 38 / 42

Lesson task •

Replace with blackberry every plant that has no rose to the left of it

Negative Lookbehind

/(?<!y)x/ matches "x" only if it is directly following NOT "y"

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console.log("foo foo foo foo 42".replace(/(?<!(?:foo\s*){3}\s*)\d\d/gi, "bar")) // foo foo foo foo 42

console.log("foo foo foo 42".replace(/(?<!(?:foo\s*){3}\s*)\d\d/gi, "bar")) // foo foo foo 42

console.log("foo foo 42".replace(/(?<!(?:foo\s*){3}\s*)\d\d/gi, "bar")) // foo foo bar

console.log("foo 42".replace(/(?<!(?:foo\s*){3}\s*)\d\d/gi, "bar")) // foo bar