Fix typo

Author: syreal17

chapters/regex.adoc

@@ -37,7 +37,7 @@ Regex can be difficult to understand at a glance, as it is meant for describing
 
 A regex pattern is a sequence of characters that define a search. The regex `xyz` would match the string 'xyz', but not 'xy' or 'xzy'.
 
-This can be expanded to include more complex patterns. For example, `x..`` or `x.*y.*z`` would also match 'xyz', but also 'xab' or 'x123y456z'. 
+This can be expanded to include more complex patterns. For example, `x..` or `x.*y.*z`` would also match 'xyz', but also 'xab' or 'x123y456z'. 
 
 Much of our data is structured in a way that can be described by regular expressions. Email address often include the '@' symbol and a domain address, and credit card numbers often follow rules based on their issuer. Even our picoCTF flags are often in the format picoCTF{}, which could be described by regex as `picoCTF\{.{1,15}\}`. 
 
@@ -83,4 +83,4 @@ else:
 
 This would print 'Match found!', as the pattern 'hello, *' matches the string 'hello, world!'. It would also return a match if the string included your name, like 'hello, reader!'.
 
-Throughout this Primer, we'll share examples from xref:book.adoc#_levels_of_code[other coding languages] as well. Regex is a very helpful tool, and so it is nice to be able to use it in many different environments, depending on what is available and your comfort level. You might see regex for helping with a database query, website, or even a CTF challenge!
+Throughout this Primer, we'll share examples from xref:book.adoc#_levels_of_code[other coding languages] as well. Regex is a very helpful tool, and so it is nice to be able to use it in many different environments, depending on what is available and your comfort level. You might see regex for helping with a database query, website, or even a CTF challenge!