diff --git a/dpdata/abacus/scf.py b/dpdata/abacus/scf.py
index 975ef5397..966410d6f 100644
--- a/dpdata/abacus/scf.py
+++ b/dpdata/abacus/scf.py
@@ -38,10 +38,10 @@ def get_block(lines, keyword, skip=0, nlines=None):
             found = True
             blk_idx = idx + 1 + skip
             line_idx = 0
-            while len(re.split("\s+", lines[blk_idx])) == 0:
+            while len(re.split(r"\s+", lines[blk_idx])) == 0:
                 blk_idx += 1
             while line_idx < nlines and blk_idx != len(lines):
-                if len(re.split("\s+", lines[blk_idx])) == 0 or lines[blk_idx] == "":
+                if len(re.split(r"\s+", lines[blk_idx])) == 0 or lines[blk_idx] == "":
                     blk_idx += 1
                     continue
                 ret.append(lines[blk_idx])
@@ -329,7 +329,7 @@ def get_nele_from_stru(geometry_inlines):
             for iline in range(
                 keyword_line_index[idx] + 1, keyword_line_index[idx + 1]
             ):
-                if len(re.split("\s+", geometry_inlines[iline])) >= 3:
+                if len(re.split(r"\s+", geometry_inlines[iline])) >= 3:
                     nele += 1
     return nele
 
diff --git a/dpdata/fhi_aims/output.py b/dpdata/fhi_aims/output.py
index c4cd92573..9947a231a 100755
--- a/dpdata/fhi_aims/output.py
+++ b/dpdata/fhi_aims/output.py
@@ -3,12 +3,12 @@
 
 import numpy as np
 
-latt_patt = "\|\s+([0-9]{1,}[.][0-9]*)\s+([0-9]{1,}[.][0-9]*)\s+([0-9]{1,}[.][0-9]*)"
-pos_patt_first = "\|\s+[0-9]{1,}[:]\s\w+\s(\w+)(\s.*[-]?[0-9]{1,}[.][0-9]*)(\s+[-]?[0-9]{1,}[.][0-9]*)(\s+[-]?[0-9]{1,}[.][0-9]*)"
-pos_patt_other = "\s+[a][t][o][m]\s+([-]?[0-9]{1,}[.][0-9]*)\s+([-]?[0-9]{1,}[.][0-9]*)\s+([-]?[0-9]{1,}[.][0-9]*)\s+(\w{1,2})"
-force_patt = "\|\s+[0-9]{1,}\s+([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})\s+([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})\s+([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})"
-eng_patt = "Total energy uncorrected.*([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})\s+eV"
-# atom_numb_patt="Number of atoms.*([0-9]{1,})"
+latt_patt = r"\|\s+([0-9]{1,}[.][0-9]*)\s+([0-9]{1,}[.][0-9]*)\s+([0-9]{1,}[.][0-9]*)"
+pos_patt_first = r"\|\s+[0-9]{1,}[:]\s\w+\s(\w+)(\s.*[-]?[0-9]{1,}[.][0-9]*)(\s+[-]?[0-9]{1,}[.][0-9]*)(\s+[-]?[0-9]{1,}[.][0-9]*)"
+pos_patt_other = r"\s+[a][t][o][m]\s+([-]?[0-9]{1,}[.][0-9]*)\s+([-]?[0-9]{1,}[.][0-9]*)\s+([-]?[0-9]{1,}[.][0-9]*)\s+(\w{1,2})"
+force_patt = r"\|\s+[0-9]{1,}\s+([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})\s+([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})\s+([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})"
+eng_patt = r"Total energy uncorrected.*([-]?[0-9]{1,}[.][0-9]*[E][+-][0-9]{1,})\s+eV"
+# atom_numb_patt=r"Number of atoms.*([0-9]{1,})"
 
 debug = False