Python: Replace '.prefix'/'.suffix' with '.matches'.

python/ql/test/library-tests/PointsTo/customise/test.ql

@@ -11,7 +11,7 @@ class HasTypeFact extends CustomPointsToOriginFact {
     exists(FunctionObject func, string name |
       func.getACall() = this and
       name = func.getName() and
-      name.prefix("has_type_".length()) = "has_type_"
+      name.matches("has\\_type\\_%")
     )
   }
 
@@ -19,7 +19,7 @@ class HasTypeFact extends CustomPointsToOriginFact {
     exists(FunctionObject func, string name |
       func.getACall() = this and
       name = func.getName() and
-      name.prefix("has_type_".length()) = "has_type_"
+      name.matches("has\\_type\\_%")
     |
       cls.getName() = name.suffix("has_type_".length())
     ) and

python/ql/test/library-tests/PointsTo/new/Consistency.ql

@@ -104,7 +104,7 @@ predicate ssa_consistency(string clsname, string problem, string what) {
   or
   exists(EssaDefinition def |
     clsname = def.getAQlClass() and
-    clsname.prefix(4) = "Essa" and
+    clsname.matches("Essa%") and
     what = " at " + def.getLocation() and
     problem = "not covered by Python-specific subclass."
   )

python/ql/test/library-tests/taint/extensions/ExtensionsLib.qll

@@ -28,7 +28,7 @@ class SimpleSource extends TaintSource {
 
 predicate visit_call(CallNode call, FunctionObject func) {
   exists(AttrNode attr, ClassObject cls, string name |
-    name.prefix(6) = "visit_" and
+    name.matches("visit\\_%") and
     func = cls.lookupAttribute(name) and
     attr.getObject("visit").refersTo(_, cls, _) and
     attr = call.getFunction()