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added missing backslash #109

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2 changes: 1 addition & 1 deletion _episodes/04-regular-expressions.md
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Expand Up @@ -24,7 +24,7 @@ A regular expression, often abbreviated to *regex*, is a method of using a seque

Regular expressions rely on the use of literal characters and metacharacters. A metacharacter is any ASCII character that has a special meaning. By using metacharacters and possibly literal characters, you can construct a regex for finding strings or files that match a pattern rather than a specific string. For example, say your organization wants to change the way they display telephone numbers on their website by removing the parentheses around the area code. Rather than search for each specific phone number (that could take forever and be prone to error) or searching for every open parenthesis character (could also take forever and return many false-positives), you could search for the pattern of a phone number.

Since regular expressions defines some ASCII characters as "metacharacters" that have more than their literal meaning, it is also important to be able to "escape" these metacharacters to use them for their normal, literal meaning. For example, the period (\.) means "match any character", but if you want to match a period (\.) then you will need to use a "\" in front of it to signal to the regular expression processor that you want to use the period as a plain old period and not a metacharacter. That notation is called "escaping" the special character. The concept of "escaping" special characters is shared across a variety of computational settings, including markdown and HTML.
Since regular expressions defines some ASCII characters as "metacharacters" that have more than their literal meaning, it is also important to be able to "escape" these metacharacters to use them for their normal, literal meaning. For example, the period (\.) means "match any character", but if you want to match a period (\.) then you will need to use a "\\" in front of it to signal to the regular expression processor that you want to use the period as a plain old period and not a metacharacter. That notation is called "escaping" the special character. The concept of "escaping" special characters is shared across a variety of computational settings, including markdown and HTML.


> ## Regex Engines and interoperability
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