Tweak regex modifiers.

Jenkinsfile.groovy

@@ -172,9 +172,10 @@ String get_changelog(repo_name) {
  */
 String extract(log_content, tag, gCube_release_version, component) {
 
-    def current_notes = "${log_content}" =~ /(?gsXm)\[v${tag}\]\s\[r${gCube_release_version}\](.*)\[v.*\]\s\[r.*\]/ [0]
-    assert current_notes: "Missing release notes for ${component}"
-    return current_notes
+    def matcher = "${log_content}" =~ /(?im)\[v${tag}\]\s\[r${gCube_release_version}\](.*)\[v.*\]\s\[r.*\]/
+    matcher.find()
+    assert matcher[0]: "Missing release notes for ${component}"
+    return matcher[0]
 }
 
 /**