Added sample code for removing special characters from a string

Author: yadavan88

scala-strings/src/test/scala/com/baeldung/scala/strings/removespecialchars/RemoveSpecialCharactersUnitTest.scala

@@ -0,0 +1,98 @@
+package com.baeldung.scala.strings.removespecialchars
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+import org.scalatest.prop.TableDrivenPropertyChecks
+
+class RemoveSpecialCharactersUnitTest
+  extends AnyFlatSpec
+  with Matchers
+  with TableDrivenPropertyChecks {
+
+  def removeAllSpecialCharUsingRegex(text: String): String = {
+    text.replaceAll("[^a-zA-Z0-9]", "")
+  }
+
+  def removeSomeSpecialCharUsingRegex(text: String): String = {
+    text.replaceAll("[^a-zA-Z0-9_\\s]", "")
+  }
+
+  def removeSpecialCharUsingWordRegex(text: String): String = {
+    text.replaceAll("\\W", "")
+  }
+
+  def removeSpecialCharUsingAnotherWordRegex(text: String): String = {
+    text.replaceAll("[^\\w\\s]", "")
+  }
+
+  def removeAllSpecialCharsUsingFilter(text: String): String = {
+    text.filter(_.isLetterOrDigit)
+  }
+
+  def removeSpecialCharsUsingCollect(text: String): String = {
+    text.collect {
+      case c if c.isLetterOrDigit || Set(' ', '_').contains(c) => c
+    }
+  }
+
+  private val removeAllSpecialTable = Table(
+    ("text", "expected"),
+    ("Special_Chars**Text $#^{} Here 2", "SpecialCharsTextHere2"),
+    ("    ", ""),
+    ("!@#$....     ", ""),
+    ("baeldung", "baeldung")
+  )
+
+  it should "remove all the special characters using regex" in {
+    forAll(removeAllSpecialTable) { (text, expected) =>
+      removeAllSpecialCharUsingRegex(text) shouldBe expected
+    }
+  }
+
+  it should "remove all the special characters using filter" in {
+    forAll(removeAllSpecialTable) { (text, expected) =>
+      removeAllSpecialCharsUsingFilter(text) shouldBe expected
+    }
+  }
+
+  it should "remove all special characters using removeAllSpecialCharUsingRegex" in {
+    assert(
+      removeAllSpecialCharUsingRegex("Hello Baeldung_!") == "HelloBaeldung"
+    )
+  }
+
+  it should "remove all special characters using removeAllSpecialCharsUsingFilter" in {
+    assert(
+      removeAllSpecialCharsUsingFilter("Hello Baeldung_!") == "HelloBaeldung"
+    )
+  }
+
+  it should "remove some special characters using removeSomeSpecialCharUsingRegex" in {
+    assert(
+      removeSomeSpecialCharUsingRegex("Hello Baeldung_!") == "Hello Baeldung_"
+    )
+  }
+
+  it should "remove special characters using removeSpecialCharUsingWordRegex" in {
+    assert(
+      removeSomeSpecialCharUsingRegex(
+        "Hello Baeldung_*()!"
+      ) == "Hello Baeldung_"
+    )
+  }
+
+  it should "remove special characters using removeSpecialCharsUsingCollect" in {
+    assert(
+      removeSpecialCharsUsingCollect("Hello Baeldung_*()!") == "Hello Baeldung_"
+    )
+  }
+
+  it should "remove special characters using removeSpecialCharUsingAnotherWordRegex" in {
+    assert(
+      removeSpecialCharUsingAnotherWordRegex(
+        "Hello Baeldung_*()!"
+      ) == "Hello Baeldung_"
+    )
+  }
+
+}