diff --git a/core/src/main/scala/sbt/internal/librarymanagement/SemanticSelectorExtra.scala b/core/src/main/scala/sbt/internal/librarymanagement/SemanticSelectorExtra.scala
index f3f28cf7a..8fafce2a0 100644
--- a/core/src/main/scala/sbt/internal/librarymanagement/SemanticSelectorExtra.scala
+++ b/core/src/main/scala/sbt/internal/librarymanagement/SemanticSelectorExtra.scala
@@ -148,7 +148,7 @@ private[librarymanagement] abstract class SemComparatorFunctions {
         (?:\.(\d+|[xX*])
           (?:\.(\d+|[xX*]))?
         )?
-      )((?:-\w+)*)$
+      )((?:-\w+(?:\.\w+)*)*)$
     """.r
   protected def parse(comparator: String): SemComparator = {
     comparator match {
diff --git a/core/src/main/scala/sbt/internal/librarymanagement/cross/CrossVersionUtil.scala b/core/src/main/scala/sbt/internal/librarymanagement/cross/CrossVersionUtil.scala
index 15e7bb9bb..1bb3d8213 100644
--- a/core/src/main/scala/sbt/internal/librarymanagement/cross/CrossVersionUtil.scala
+++ b/core/src/main/scala/sbt/internal/librarymanagement/cross/CrossVersionUtil.scala
@@ -22,12 +22,13 @@ object CrossVersionUtil {
 
   private val longPattern = """\d{1,19}"""
   private val basicVersion = raw"""($longPattern)\.($longPattern)\.($longPattern)"""
+  private val tagPattern = raw"""(?:\w+(?:\.\w+)*)"""
   private val ReleaseV = raw"""$basicVersion(-\d+)?""".r
-  private val BinCompatV = raw"""$basicVersion(-\w+)?-bin(-.*)?""".r
+  private[sbt] val BinCompatV = raw"""$basicVersion(-$tagPattern)?-bin(-.*)?""".r
   private val CandidateV = raw"""$basicVersion(-RC\d+)""".r
-  private val MilestonV = raw"""$basicVersion(-M\d+)""".r
-  private val NonReleaseV_n = raw"""$basicVersion([-\w]*)""".r // 0-n word suffixes, with leading dashes
-  private val NonReleaseV_1 = raw"""$basicVersion(-\w+)""".r // 1 word suffix, after a dash
+  private val MilestonV = raw"""$basicVersion(-M$tagPattern)""".r
+  private val NonReleaseV_n = raw"""$basicVersion((?:-$tagPattern)*)""".r // 0-n word suffixes, with leading dashes
+  private val NonReleaseV_1 = raw"""$basicVersion(-$tagPattern)""".r // 1 word suffix, after a dash
   private[sbt] val PartialVersion = raw"""($longPattern)\.($longPattern)(?:\..+)?""".r
 
   private[sbt] def isSbtApiCompatible(v: String): Boolean = sbtApiVersion(v).isDefined
diff --git a/core/src/main/scala/sbt/librarymanagement/CrossVersionExtra.scala b/core/src/main/scala/sbt/librarymanagement/CrossVersionExtra.scala
index a37a52d7c..9de8605ea 100644
--- a/core/src/main/scala/sbt/librarymanagement/CrossVersionExtra.scala
+++ b/core/src/main/scala/sbt/librarymanagement/CrossVersionExtra.scala
@@ -102,7 +102,7 @@ private[librarymanagement] abstract class CrossVersionFunctions {
     }
 
   private[sbt] def patchFun(fullVersion: String): String = {
-    val BinCompatV = """(\d+)\.(\d+)\.(\d+)(-\w+)??-bin(-.*)?""".r
+    import sbt.internal.librarymanagement.cross.CrossVersionUtil.BinCompatV
     fullVersion match {
       case BinCompatV(x, y, z, w, _) => s"""$x.$y.$z${if (w == null) "" else w}"""
       case other                     => other
diff --git a/core/src/main/scala/sbt/librarymanagement/VersionNumber.scala b/core/src/main/scala/sbt/librarymanagement/VersionNumber.scala
index 90897351d..8ce15c72d 100644
--- a/core/src/main/scala/sbt/librarymanagement/VersionNumber.scala
+++ b/core/src/main/scala/sbt/librarymanagement/VersionNumber.scala
@@ -66,7 +66,7 @@ object VersionNumber {
     def splitDash(s: String) = splitOn(s, '-')
     def splitPlus(s: String) = splitOn(s, '+') map ("+" + _)
 
-    val TaggedVersion = """(\d{1,14})([\.\d{1,14}]*)((?:-[\w\.]+)*)((?:\+.+)*)""".r
+    val TaggedVersion = """(\d{1,14})([\.\d{1,14}]*)((?:-\w+(?:\.\w+)*)*)((?:\+.+)*)""".r
     val NonSpaceString = """(\S+)""".r
 
     s match {
diff --git a/core/src/test/scala/sbt/librarymanagement/CrossVersionTest.scala b/core/src/test/scala/sbt/librarymanagement/CrossVersionTest.scala
index 05e849520..454bb5403 100644
--- a/core/src/test/scala/sbt/librarymanagement/CrossVersionTest.scala
+++ b/core/src/test/scala/sbt/librarymanagement/CrossVersionTest.scala
@@ -138,6 +138,9 @@ class CrossVersionTest extends UnitSpec {
   it should "for 1.3.0-SNAPSHOT return 1.0" in {
     binarySbtVersion("1.3.0-SNAPSHOT") shouldBe "1.0"
   }
+  it should "for 1.3.0-A1-B1.1 return 1.0" in {
+    binarySbtVersion("1.3.0-A1-B1.1") shouldBe "1.0"
+  }
   it should "for 1.10.0 return 1.0" in {
     binarySbtVersion("1.10.0") shouldBe "1.0"
   }
@@ -216,6 +219,9 @@ class CrossVersionTest extends UnitSpec {
   it should "for 3.0.0-M3-bin-20201215-cbe50b3-NIGHTLY return 3.0.0-M3" in {
     binaryScalaVersion("3.0.0-M3-bin-20201215-cbe50b3-NIGHTLY") shouldBe "3.0.0-M3"
   }
+  it should "for 3.0.0-M3.5-bin-20201215-cbe50b3-NIGHTLY return 3.0.0-M3" in {
+    binaryScalaVersion("3.0.0-M3.5-bin-20201215-cbe50b3-NIGHTLY") shouldBe "3.0.0-M3.5"
+  }
   it should "for 3.0.0-RC1 return 3.0.0-RC1" in {
     binaryScalaVersion("3.0.0-RC1") shouldBe "3.0.0-RC1"
   }
@@ -268,6 +274,9 @@ class CrossVersionTest extends UnitSpec {
   it should "for 2.11.8-RC1-bin-extra return 2.11.8-RC1" in {
     patchVersion("2.11.8-RC1-bin-extra") shouldBe Some("artefact_2.11.8-RC1")
   }
+  it should "for 2.11.8-X1.5-bin-extra return 2.11.8-X1.5" in {
+    patchVersion("2.11.8-X1.5-bin-extra") shouldBe Some("artefact_2.11.8-X1.5")
+  }
 
   private def constantVersion(value: String) =
     CrossVersion(CrossVersion.constant(value), "dummy1", "dummy2") map (fn => fn("artefact"))
diff --git a/core/src/test/scala/sbt/librarymanagement/SemanticSelectorSpec.scala b/core/src/test/scala/sbt/librarymanagement/SemanticSelectorSpec.scala
index 411554260..cce9b4ff1 100644
--- a/core/src/test/scala/sbt/librarymanagement/SemanticSelectorSpec.scala
+++ b/core/src/test/scala/sbt/librarymanagement/SemanticSelectorSpec.scala
@@ -75,6 +75,7 @@ class SemanticSelectorSpec extends AnyFreeSpec with Matchers {
 
   semsel(">=1.2.3") { sel =>
     assertMatches(sel, "1.2.4-beta")
+    assertMatches(sel, "1.2.4-beta.1")
     assertMatches(sel, "1.2.3")
     assertMatches(sel, "1.3")
     assertMatches(sel, "2")
@@ -306,6 +307,21 @@ class SemanticSelectorSpec extends AnyFreeSpec with Matchers {
     assertNotMatches(sel, "1.2.2")
   }
 
+  semsel(">=1.2.3-beta.5") { sel =>
+    assertMatches(sel, "1.3-alpha")
+    assertMatches(sel, "1.2.3")
+    assertMatches(sel, "1.2.3-beta.5")
+    assertMatches(sel, "1.2.3-beta.6-3")
+    assertMatches(sel, "1.2.3-beta.7")
+    assertMatches(sel, "1.2.3-beta.gamma")
+    assertMatches(sel, "1.2.4")
+    assertMatches(sel, "1.3")
+    assertNotMatches(sel, "1.2.3-alpha-3")
+    assertNotMatches(sel, "1.2.3-beta-1")
+    assertNotMatches(sel, "1.2.3-beta")
+    assertNotMatches(sel, "1.2.2")
+  }
+
   Seq(
     // invalid operator
     "~1.2.3",
@@ -339,7 +355,6 @@ class SemanticSelectorSpec extends AnyFreeSpec with Matchers {
     "1.0.0 - 2.0.0 || - 2.0.0",
     "1.0.0- 2.0.0",
     "1.0.0 -2.0.0",
-    "1.0.0-2.0.0",
     "-",
     // minor and patch versions are required for pre-release version
     "1.2-alpha-beta",