Update README.md

Re-use 2.3.1 example in 2.3.2 to see difference.
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cricri-pingouin 2020-05-19 11:11:25 +01:00 committed by GitHub
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@ -223,6 +223,12 @@ example, the regular expression `c.+t` means: a lowercase `c`, followed by
at least one character, followed by a lowercase `t`. It needs to be
clarified that`t` is the last `t` in the sentence.
<pre>
"\s+cat\s+" => The fat<a href="#learn-regex"><strong> cat </strong></a>sat on the concatenation.
</pre>
[Test the regular expression](https://regex101.com/r/gGrwuz/1)
<pre>
"c.+t" => The fat <a href="#learn-regex"><strong>cat sat on the mat</strong></a>.
</pre>