diff --git a/src/chordpro/base.py b/src/chordpro/base.py
index d755a6c..f925f33 100644
--- a/src/chordpro/base.py
+++ b/src/chordpro/base.py
@@ -1,14 +1,8 @@
-import re
-
 from hyphen import Hyphenator
 
-from chordpro.constants import KNOWN_DIRECTIVES, KNOWN_VERSE_TYPES
+from chordpro.constants import DIRECTIVE, CHORD_WORD, CHORUS_MARKER, KNOWN_DIRECTIVES, \
+    START_OF, END_OF
 
-DIRECTIVE = re.compile(r'\{(.*?): *(.*?)\}')
-START_OF = re.compile(r'\{start_of_(' + '|'.join(KNOWN_VERSE_TYPES) + r')(: *(.*?))?\}')
-END_OF = re.compile(r'\{end_of_(' + '|'.join(KNOWN_VERSE_TYPES) + r')\}')
-CHORUS_MARKER = re.compile(r'\{chorus(: *(.*?))?\}')
-CHORD_WORD = re.compile(r'(.*?)\[(.*?)\]')
 HYPHEN_CACHE = {}
 SYLLABLE_EXCEPTIONS = {
     'outer': ['out', 'er']
diff --git a/src/chordpro/constants.py b/src/chordpro/constants.py
index cc88a39..8e7fc39 100644
--- a/src/chordpro/constants.py
+++ b/src/chordpro/constants.py
@@ -1,3 +1,5 @@
+import re
+
 KNOWN_DIRECTIVES = [
     ('title', 't'),
     ('subtitle', 'st'),
@@ -27,3 +29,8 @@ GERMAN_NOTES = '[CDEFGAH]'
 NEOLATIN_NOTES = '(Do|Re|Mi|Fa|Sol|La|Si)'
 CHORD_SUFFIXES = '(b|bb)?(#)?(m|maj7|maj|min7|min|sus)?(1|2|3|4|5|6|7|8|9)?'
 SLIM_CHARS = 'fiíIÍjlĺľrtť.,;/ ()|"\'!:\\'
+DIRECTIVE = re.compile(r'\{(.*?): *(.*?)\}')
+START_OF = re.compile(r'\{start_of_(' + '|'.join(KNOWN_VERSE_TYPES) + r')(: *(.*?))?\}')
+END_OF = re.compile(r'\{end_of_(' + '|'.join(KNOWN_VERSE_TYPES) + r')\}')
+CHORUS_MARKER = re.compile(r'\{chorus(: *(.*?))?\}')
+CHORD_WORD = re.compile(r'(.*?)\[(.*?)\]')