From 4c61807293bfe8053ea66cd538ea43b8e8adf4d4 Mon Sep 17 00:00:00 2001
From: Brian Yue <code.byyue@gmail.com>
Date: Wed, 6 Jul 2022 22:10:17 +0800
Subject: [PATCH 1/2] Elaborate Regular Expression Patterns

---
 _tour/regular-expression-patterns.md | 32 ++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/_tour/regular-expression-patterns.md b/_tour/regular-expression-patterns.md
index aa51821463..8f3d7fd003 100644
--- a/_tour/regular-expression-patterns.md
+++ b/_tour/regular-expression-patterns.md
@@ -58,3 +58,35 @@ key: margin value: 0
 key: height value: 108px
 key: width value: 100
 ```
+
+Moreover, you can combine Pattern Matching and Regular Expression Patterns:
+
+```scala mdoc
+def saveContactInfomation(contact: String): Unit = {
+  import scala.util.matching.Regex
+
+  val emailPattern: Regex = """^(\w+)@(\w+(.\w+)+)$""".r
+  val phonePattern: Regex = """^(\d{3}-\d{3}-\d{4})$""".r
+
+  contact match {
+    case emailPattern(localPart, domainName, _) => 
+      println(s"Hi $localPart, we have saved your email address.")
+    case phonePattern(phoneNumber) => 
+      println(s"Hi, we have saved your phone number $phoneNumber.")
+    case _ => 
+      println("Invalid contact information, neither an email address nor phone number.")
+  }
+}
+
+saveContactInfomation("123-456-7890")
+saveContactInfomation("JohnSmith@sample.domain.com")
+saveContactInfomation("2 Franklin St, Mars, Milky Way")
+```
+
+The output would be:
+
+```
+Hi, we have saved your phone number 123-456-7890.
+Hi JohnSmith, we have saved your email address.
+Invalid contact information, neither an email address nor phone number.
+```
\ No newline at end of file

From c2944219cee5bd05f5e3a89d591f2b8ffea5846b Mon Sep 17 00:00:00 2001
From: Brian Yue <46839413+byyue@users.noreply.github.com>
Date: Wed, 6 Jul 2022 22:56:34 +0800
Subject: [PATCH 2/2] Make the description clearer

Co-authored-by: Julien Richard-Foy <julien@richard-foy.fr>
---
 _tour/regular-expression-patterns.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/_tour/regular-expression-patterns.md b/_tour/regular-expression-patterns.md
index 8f3d7fd003..2669df635b 100644
--- a/_tour/regular-expression-patterns.md
+++ b/_tour/regular-expression-patterns.md
@@ -59,7 +59,7 @@ key: height value: 108px
 key: width value: 100
 ```
 
-Moreover, you can combine Pattern Matching and Regular Expression Patterns:
+Moreover, regular expressions can be used as patterns (in `match` expressions) to conveniently extract the matched groups:
 
 ```scala mdoc
 def saveContactInfomation(contact: String): Unit = {