Modify regex in memtest header

Specify 40-char hex, and allow - _ / . in branch name

Author: fcooper8472

log-files/index.html

@@ -20,8 +20,10 @@ <h2>September 2023</h2>
               <a href="2023-09-27_16-39-40/index.html">2023-09-27_16-39-40</a>
             </td>
             <td>green</td>
-            <td>unknown branch</td>
-            <td>unknown commit</td>
+            <td>memtest-summary</td>
+            <td>
+              <a href="https://github.com/Chaste/Chaste/commit/db1876898339369ee96312a3ef79cdb8f06222be">db1876898339369ee96312a3ef79cdb8f06222be</a>
+            </td>
           </tr>
           <tr class="tr-green">
             <td>
@@ -122,8 +124,10 @@ <h2>September 2023</h2>
               <a href="2023-09-25_12-50-59/index.html">2023-09-25_12-50-59</a>
             </td>
             <td>green</td>
-            <td>unknown branch</td>
-            <td>unknown commit</td>
+            <td>173/merge</td>
+            <td>
+              <a href="https://github.com/Chaste/Chaste/commit/48e11fed71d9a84049e3983e89622d90bad86913">48e11fed71d9a84049e3983e89622d90bad86913</a>
+            </td>
           </tr>
           <tr class="tr-green">
             <td>

write_index.py

@@ -88,7 +88,7 @@ def write_index_file(list_of_logs: list[str]) -> None:
     unique_dates = sorted(list(unique_dates), reverse=True)
 
     # Regex to find the branch name and commit hash for this memtest output
-    header_pattern = r'<h2>Memtest output for commit <a href="https:\/\/github\.com\/Chaste\/Chaste\/commit\/(\w+)">\1<\/a> on branch (\w+)<\/h2>'
+    header_pattern = r'([0-9a-fA-F]{40})">\1<\/a> on branch ([a-zA-Z0-9\-\_\/\.]+)<\/h2>'
     header_regex = re.compile(header_pattern)
 
     # Regex to find the number of green, orange and red tests in a given file