Correct grammar in intro title

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Tom McAndrew 2020-03-10 17:13:25 +00:00 committed by GitHub
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* [Tiếng Việt](translations/README-vn.md)
* [فارسی](translations/README-fa.md)
## What is Regular Expression?
## What are Regular Expressions?
> A regular expression is a group of characters or symbols which is used to find a specific pattern in a text.