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Added regex backreference

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Gzix-Joker 2020-06-30 19:35:51 +00:00
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@ -591,6 +591,21 @@ possible. We can use `?` to match in a lazy way, which means the match should be
[Test the regular expression](https://regex101.com/r/AyAdgJ/2)
## 7. Backreferences
A backreference in a regular expression identifies a previously matched group and looks for exactly the same text again. A simple example of the use of backreferences is when you wish to look for adjacent, repeated words in some text.
<pre>
"/([a-z])\1/g" => Ha<a href="#learn-regex"><strong>pp</strong></a>ine<a href="#learn-regex"><strong>ss</strong></a>. </pre>
[Test the regular expression](https://regex101.com/r/5Nclso/1)
<pre>
"/(\")(.*?)\1/" => He said "<a href="#learn-regex"><strong>She's beautiful</strong></a>" </pre>
[Test the regular expression](https://regex101.com/r/ykVPb4/1)
## Contribution