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Merge pull request LibraryCarpentry#222 from doujouDC/patch-1
Update 02-match-extract-strings.md
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episodes/02-match-extract-strings.md

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@@ -177,7 +177,7 @@ The string before the "@" could contain any kind of word character, special char
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`-` matches a dash
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`[]` the brackets enclose the boolean string that 'OR' the word characters, dot, and dash.
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`[]` the brackets enclose the Boolean string that 'OR' the word characters, dot, and dash.
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`+` matches any word character OR digit OR character OR `-` repeated 1 or more times
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@@ -209,7 +209,7 @@ See the previous exercise for the explanation of the expression up to the `+`
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`{2,3}` limits the number of word characters and/or digits to a two or three-character string.
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`[]` the brackets enclose the boolean string that 'OR' the digits, word characters, characters and dash.
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`[]` the brackets enclose the Boolean string that 'OR' the digits, word characters, characters and dash.
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`+` matches any word character OR digit OR character OR `-` repeated 1 or more times
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- Regular expressions are useful for searching and cleaning data.
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- Test regular expressions interactively with [regex101.com](https://regex101.com/) or [RegExr.com](https://www.regexr.com/), and visualise them with [regexper.com](https://regexper.com/).
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- Test regular expressions interactively with [regex101.com](https://regex101.com/) or [RegExr.com](https://www.regexr.com/), and visualize them with [regexper.com](https://regexper.com/).
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- Test yourself with [RegexCrossword.com](https://regexcrossword.com/) or via the quiz and exercises in this lesson.
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