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Merge pull request #2445 from msisaifu/fix-typo

fix typo

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9-regular-expressions/14-regexp-lookahead-lookbehind
- 1-find-non-negative-integers
  - solution.md
- article.md

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`@@ -1,7 +1,7 @@`
`1`	`1`
`2`	`2`	The regexp for an integer number is `pattern:\d+`.
`3`	`3`
`4`		-We can exclude negatives by prepending it with the negative lookahead: `pattern:(?<!-)\d+`.
	`4`	+We can exclude negatives by prepending it with the negative lookbehind: `pattern:(?<!-)\d+`.
`5`	`5`
`6`	`6`	`Although, if we try it now, we may notice one more "extra" result:`
`7`	`7`

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`@@ -1,6 +1,6 @@`
`1`	`1`	`# Lookahead and lookbehind`
`2`	`2`
`3`		`-Sometimes we need to find only those matches for a pattern that are followed or preceeded by another pattern.`
	`3`	`+Sometimes we need to find only those matches for a pattern that are followed or preceded by another pattern.`
`4`	`4`
`5`	`5`	`There's a special syntax for that, called "lookahead" and "lookbehind", together referred to as "lookaround".`
`6`	`6`

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