Use lab name 'regex1' consistently

Signed-off-by: David A. Wheeler <[email protected]>

Author: david-a-wheeler

docs/labs/README.md

@@ -15,7 +15,7 @@ Here are the labs available:
 
 * [hello](hello.html) - simple "Hello, world!" demo
 * [input1](input1.html) - input validation (simple types)
-* [regex](regex1.html) - regular expressions (regexes)
+* [regex1](regex1.html) - regular expressions (regexes)
 * [input2](input2.html) - input validation (more complex situations)
 * [csp1](csp1.html) - Content Security Policy (CSP)
 
@@ -46,7 +46,7 @@ mappings to existing labs or people who have agreed to work on one:
     * Input Validation: A Few Simple Data Types - [input1](input1.html)
     * Sidequest: Text, Unicode, and Locales
     * Validating Text
-    * Introduction to Regular Expressions - [regex](regex1.html)
+    * Introduction to Regular Expressions - [regex1](regex1.html)
     * Using Regular Expressions for Text Input Validation - [input2](input2.html)
     * Countering ReDoS Attacks on Regular Expressions - NEED
   * Input Validation: Beyond Numbers and Text