diff --git a/parsers/survex.py b/parsers/survex.py
index ead5ac8..4c0a6e5 100644
--- a/parsers/survex.py
+++ b/parsers/survex.py
@@ -270,9 +270,9 @@ class LoadingSurvex:
     rx_flagsnot = re.compile(r"not\s")
     rx_linelen = re.compile(r"[\d\-+.]+$")
     instruments = "(bitch|bodger|bolt|bolter|bolting|book|clino|comp|compass|consultant|disto|distox|distox2|dog|dogsbody|drawing|drill|gps|helper|inst|instr|instrument|monkey|nagging|nail|nail_polish|nail_polish_bitch|nail_polish_monkey|nail_varnish|nail_varnish_bitch|note|paint|photo|pic|point|polish|powerdrill|rig|rigger|rigging|shoot|sketch|slacker|something|tape|topodroid|unknown|useless|varnish|waiting_patiently)"
-    rx_teammem = re.compile(r"(?i)" + instruments + "?(?:es|s)?\s+(.*)$")
-    rx_teamold = re.compile(r"(?i)(.*)\s+" + instruments + "?(?:es|s)?$")
-    rx_teamabs = re.compile(r"(?i)^\s*(" + instruments + ")?(?:es|s)?\s*$")
+    rx_teammem = re.compile(r"(?i)" + instruments + r"?(?:es|s)?\s+(.*)$")
+    rx_teamold = re.compile(r"(?i)(.*)\s+" + instruments + r"?(?:es|s)?$")
+    rx_teamabs = re.compile(r"(?i)^\s*(" + instruments + r")?(?:es|s)?\s*$")
     rx_person = re.compile(r"(?i) and |/| / |, | , |&| & | \+ |^both$|^none$")
     rx_qm = re.compile(
 #       r"(?i)^\s*QM(\d+)\s+(.+)\s+([\w\-\_]+)\.([\w\.\-]+)\s+(([\w\-]+)\.([\w\.\-]+)|\-)\s+(.+)$"
@@ -657,7 +657,7 @@ class LoadingSurvex:
 
     def LoadSurvexAlias(self, survexblock, line):
         # *alias station - ..
-        splayalias = re.match("(?i)\s*station\s*\-\s*\.\.\s*$", line)
+        splayalias = re.match(r"(?i)\s*station\s*\-\s*\.\.\s*$", line)
         if splayalias:
             self.flagsstar["splayalias"] = True
             print(line)
@@ -672,7 +672,7 @@ class LoadingSurvex:
         tapeunits = self.rx_tapelng.match(line)  # tape|length
         if not tapeunits:
             return
-        convert = re.match("(?i)(\w*)\s*([\.\d]+)\s*(\w*)", line)
+        convert = re.match(r"(?i)(\w*)\s*([\.\d]+)\s*(\w*)", line)
         if convert:
             factor = convert.groups()[1]
             self.unitsfactor = float(factor)
@@ -683,8 +683,8 @@ class LoadingSurvex:
                 print(self.insp + message)
                 stash_data_issue(parser="survexunits", message=message)
 
-        feet = re.match("(?i).*feet$", line)
-        metres = re.match("(?i).*(METRIC|METRES|METERS)$", line)
+        feet = re.match(r"(?i).*feet$", line)
+        metres = re.match(r"(?i).*(METRIC|METRES|METERS)$", line)
         if feet:
             self.units = "feet"
         elif metres:
@@ -1929,8 +1929,8 @@ class LoadingSurvex:
                 cmd, args = star.groups()
                 cmd = cmd.lower()
                 if self.rx_include2.match(cmd):
-                # rx_include2 = re.compile("(?i)include$")
-                # if re.match("(?i)include$", cmd):
+                # rx_include2 = re.compile(r"(?i)include$")
+                # if re.match(r"(?i)include$", cmd):
                     includepath = os.path.normpath(os.path.join(os.path.split(path)[0], re.sub(r"\.svx$", "", args))) # normalises path syntax
                     if self.never_seen(includepath, path):
                         fullpath = os.path.join(settings.SURVEX_DATA, includepath + ".svx")
@@ -1965,7 +1965,7 @@ class LoadingSurvex:
                             print(message, file=sys.stderr)
                             stash_data_issue(parser="survex", message=message, url=None, sb=(path))
                 elif self.rx_begin2.match(cmd):
-                #elif re.match("(?i)begin$", cmd):
+                #elif re.match(r"(?i)begin$", cmd):
                     self.depthbegin += 1
                     depth = " " * self.depthbegin
                     if args:
@@ -1976,7 +1976,7 @@ class LoadingSurvex:
                     flinear.write(f"            {self.depthbegin:2} {depth} *begin {args}\n")
                     pass
                 elif self.rx_end2.match(cmd):
-                # elif re.match("(?i)end$", cmd):
+                # elif re.match(r"(?i)end$", cmd):
                     depth = " " * self.depthbegin
                     flinear.write(f"            {self.depthbegin:2} {depth} *end   {args}\n")
                     if not args:
@@ -1994,7 +1994,7 @@ class LoadingSurvex:
                     self.depthbegin -= 1
                     pass
                 elif self.rx_title2.match(cmd):
-                # elif re.match("(?i)title$", cmd):
+                # elif re.match(r"(?i)title$", cmd):
                     depth = " " * self.depthbegin
                     flinear.write(f"                    {self.depthbegin:2} {depth} *title {args}\n")
                     pass