small modification

tools/compleasm/compleasm.xml

@@ -1,5 +1,5 @@
 <tool id="compleasm" name="compleasm" version="@TOOL_VERSION@+galaxy0" profile="20.01">
-    <description>evaluate the completeness of genome assemblies</description>
+    <description>completeness of genome assemblies</description>
     <macros>
         <import>macros.xml</import>
     </macros>
@@ -24,8 +24,16 @@
             <option value="busco" selected="true">BUSCO</option>
             <option value="lite">Lite</option>
         </param>
-        <param argument="--specified_contigs" type="text" label="Specify the contigs to be evaluated" optional="true" help="e.g. chr1 chr2 chr3. If not specified, all contigs will be evaluated"/>
 
+        <param argument="--specified_contigs" type="text" label="Specify the contigs to be evaluated" optional="true" help="e.g. chr1 chr2 chr3. If not specified, all contigs will be evaluated">
+            <sanitizer invalid_char="">
+                <valid initial="string.letters,string.digits">
+                    <add value="_" />
+                </valid>
+            </sanitizer>
+            <validator type="regex">[0-9a-zA-Z_ ]+</validator>
+        </param>
+
         <param name="outputs" type="select" multiple="true" label="Which outputs should be generated">
             <option value="full_table_busco" selected="true">full busco table</option>
             <option value="full_table">full table</option>