diff --git a/common.js b/common.js
index f11ba12..7754661 100644
--- a/common.js
+++ b/common.js
@@ -11,6 +11,14 @@ export const windows = (os.platform() === 'win32')
 // Extract to SSD on Windows, see https://github.com/ruby/setup-ruby/pull/14
 export const drive = (windows ? (process.env['GITHUB_WORKSPACE'] || 'C')[0] : undefined)
 
+export function partition(string, separator) {
+  const i = string.indexOf(separator)
+  if (i === -1) {
+    throw new Error(`No separator ${separator} in string ${string}`)
+  }
+  return [string.slice(0, i), string.slice(i + separator.length, string.length)]
+}
+
 export async function measure(name, block) {
   return await core.group(name, async () => {
     const start = performance.now()
@@ -95,7 +103,7 @@ export function getToolCacheRubyPrefix(platform, version) {
 export function win2nix(path) {
   if (/^[A-Z]:/i.test(path)) {
     // path starts with drive
-    path = `/${path[0].toLowerCase()}${path.split(':', 2)[1]}`
+    path = `/${path[0].toLowerCase()}${partition(path, ':')[1]}`
   }
   return path.replace(/\\/g, '/').replace(/ /g, '\\ ')
 }
diff --git a/dist/index.js b/dist/index.js
index 44a4c39..380de72 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -27796,7 +27796,7 @@ function addVCVARSEnv() {
   let newSet = cp.execSync(cmd).toString().trim().split(/\r?\n/)
   newSet = newSet.filter(line => line.match(/\S=\S/))
   newSet.forEach(s => {
-    let [k,v] = s.split('=', 2)
+    let [k,v] = common.partition(s, '=')
     newEnv.set(k,v)
   })
 
@@ -32094,6 +32094,7 @@ exports.default = _default;
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "windows", function() { return windows; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "drive", function() { return drive; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "partition", function() { return partition; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "measure", function() { return measure; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "isHeadVersion", function() { return isHeadVersion; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "isStableVersion", function() { return isStableVersion; });
@@ -32116,6 +32117,14 @@ const windows = (os.platform() === 'win32')
 // Extract to SSD on Windows, see https://github.com/ruby/setup-ruby/pull/14
 const drive = (windows ? (process.env['GITHUB_WORKSPACE'] || 'C')[0] : undefined)
 
+function partition(string, separator) {
+  const i = string.indexOf(separator)
+  if (i === -1) {
+    throw new Error(`No separator ${separator} in string ${string}`)
+  }
+  return [string.slice(0, i), string.slice(i + separator.length, string.length)]
+}
+
 async function measure(name, block) {
   return await core.group(name, async () => {
     const start = performance.now()
@@ -32200,7 +32209,7 @@ function getToolCacheRubyPrefix(platform, version) {
 function win2nix(path) {
   if (/^[A-Z]:/i.test(path)) {
     // path starts with drive
-    path = `/${path[0].toLowerCase()}${path.split(':', 2)[1]}`
+    path = `/${path[0].toLowerCase()}${partition(path, ':')[1]}`
   }
   return path.replace(/\\/g, '/').replace(/ /g, '\\ ')
 }
@@ -51269,7 +51278,7 @@ function parseRubyEngineAndVersion(rubyVersion) {
   } else if (rubyVersion === '.tool-versions') { // Read from .tool-versions
     const toolVersions = fs.readFileSync('.tool-versions', 'utf8').trim()
     const rubyLine = toolVersions.split(/\r?\n/).filter(e => e.match(/^ruby\s/))[0]
-    rubyVersion = rubyLine.split(/\s+/, 2)[1]
+    rubyVersion = rubyLine.match(/^ruby\s+(.+)$/)[1]
     console.log(`Using ${rubyVersion} as input from file .tool-versions`)
   }
 
@@ -51281,7 +51290,7 @@ function parseRubyEngineAndVersion(rubyVersion) {
     engine = rubyVersion
     version = '' // Let the logic in validateRubyEngineAndVersion() find the version
   } else { // engine-X.Y.Z
-    [engine, version] = rubyVersion.split('-', 2)
+    [engine, version] = common.partition(rubyVersion, '-')
   }
 
   return [engine, version]
diff --git a/index.js b/index.js
index 0b9bbf9..76297fc 100644
--- a/index.js
+++ b/index.js
@@ -106,7 +106,7 @@ function parseRubyEngineAndVersion(rubyVersion) {
   } else if (rubyVersion === '.tool-versions') { // Read from .tool-versions
     const toolVersions = fs.readFileSync('.tool-versions', 'utf8').trim()
     const rubyLine = toolVersions.split(/\r?\n/).filter(e => e.match(/^ruby\s/))[0]
-    rubyVersion = rubyLine.split(/\s+/, 2)[1]
+    rubyVersion = rubyLine.match(/^ruby\s+(.+)$/)[1]
     console.log(`Using ${rubyVersion} as input from file .tool-versions`)
   }
 
@@ -118,7 +118,7 @@ function parseRubyEngineAndVersion(rubyVersion) {
     engine = rubyVersion
     version = '' // Let the logic in validateRubyEngineAndVersion() find the version
   } else { // engine-X.Y.Z
-    [engine, version] = rubyVersion.split('-', 2)
+    [engine, version] = common.partition(rubyVersion, '-')
   }
 
   return [engine, version]
diff --git a/windows.js b/windows.js
index 89cc401..2756062 100644
--- a/windows.js
+++ b/windows.js
@@ -120,7 +120,7 @@ export function addVCVARSEnv() {
   let newSet = cp.execSync(cmd).toString().trim().split(/\r?\n/)
   newSet = newSet.filter(line => line.match(/\S=\S/))
   newSet.forEach(s => {
-    let [k,v] = s.split('=', 2)
+    let [k,v] = common.partition(s, '=')
     newEnv.set(k,v)
   })