fix: parsing of the Go version

Author: ldez

helpers.go

@@ -34,8 +34,8 @@ import (
 // initialization only imports.
 //
 // Usage:
-// 	node, matched := MatchCallByPackage(n, ctx, "math/rand", "Read")
 //
+//	node, matched := MatchCallByPackage(n, ctx, "math/rand", "Read")
 func MatchCallByPackage(n ast.Node, c *Context, pkg string, names ...string) (*ast.CallExpr, bool) {
 	importedName, found := GetImportedName(pkg, c)
 	if !found {
@@ -474,9 +474,25 @@ func RootPath(root string) (string, error) {
 
 // GoVersion returns parsed version of Go from runtime
 func GoVersion() (int, int, int) {
-	versionParts := strings.Split(runtime.Version(), ".")
-	major, _ := strconv.Atoi(versionParts[0][2:])
-	minor, _ := strconv.Atoi(versionParts[1])
-	build, _ := strconv.Atoi(versionParts[2])
+	return parseGoVersion(runtime.Version())
+}
+
+// parseGoVersion parses Go version.
+// example:
+// - go1.19rc2
+// - go1.19beta2
+// - go1.19.4
+// - go1.19
+func parseGoVersion(version string) (int, int, int) {
+	exp := regexp.MustCompile(`go(\d+).(\d+)(?:.(\d+))?.*`)
+	parts := exp.FindStringSubmatch(version)
+	if len(parts) <= 1 {
+		return 0, 0, 0
+	}
+
+	major, _ := strconv.Atoi(parts[1])
+	minor, _ := strconv.Atoi(parts[2])
+	build, _ := strconv.Atoi(parts[3])
+
 	return major, minor, build
 }