Include links to sparql docs

lod/01_SPARQL_Introduction.ipynb

@@ -1771,9 +1771,9 @@
     "In one of the exercises, we excluded lead and backing vocals from the list of instruments.\n",
     "However, are those the only types of vocals?\n",
     "\n",
-    "You can check if a string or URI matches a regular expression with `regex(?variable, \"<regex>\", \"i\")`.\n",
+    "You can check if a string or URI matches a regular expression with `regex(?variable, \"<regex>\")`.\n",
     "\n",
-    "Consult if needed how to use regular expressions with SPARQL [here](https://www.w3.org/TR/rdf-sparql-query/)."
+    "The documentation for regular expressions in SPARQL is [here](https://www.w3.org/TR/rdf-sparql-query/)."
    ]
   },
   {
@@ -1844,24 +1844,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.5"
+   "version": "3.7.2"
-  },
-  "latex_envs": {
-   "LaTeX_envs_menu_present": true,
-   "autocomplete": true,
-   "bibliofile": "biblio.bib",
-   "cite_by": "apalike",
-   "current_citInitial": 1,
-   "eqLabelWithNumbers": true,
-   "eqNumInitial": 1,
-   "hotkeys": {
-    "equation": "Ctrl-E",
-    "itemize": "Ctrl-I"
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-   "labels_anchors": false,
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  "nbformat": 4,