A regular expression, or regex for short, is a pattern describing a certain amount of text. On this website, regular expressions are highlighted in red as regex.
This first example is actually a perfectly valid regex. It is the most basic pattern, simply matching the literal text regex. Matches are highlighted in blue on this site.
I will use the term "string" to indicate the text that I am applying the regular expression to. I will highlight them in green.
http://www.regular-expressions.info/quickstart.html
http://www.regular-expressions.info/reference.html
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