Reformat header patterns using re.VERBOSE for readability.

Author: Benjamin Moody

wfdb/io/_header.py

@@ -100,29 +100,34 @@
 
 # Regexp objects for reading headers
 # Record line
-_rx_record = re.compile(''.join(
-    ["[ \t]*",
-     "(?P<record_name>[-\w]+)/?(?P<n_seg>\d*)[ \t]+",
-     "(?P<n_sig>\d+)[ \t]*(?P<fs>\d*\.?\d*)/*(?P<counter_freq>-?\d*\.?\d*)",
-     "\(?(?P<base_counter>-?\d*\.?\d*)\)?[ \t]*(?P<sig_len>\d*)[ \t]*",
-     "(?P<base_time>\d{,2}:?\d{,2}:?\d{,2}\.?\d{,6})[ \t]*",
-     "(?P<base_date>\d{,2}/?\d{,2}/?\d{,4})"])
-)
+_rx_record = re.compile(
+    r'''
+    [ \t]*
+    (?P<record_name>[-\w]+)/?(?P<n_seg>\d*)[ \t]+
+    (?P<n_sig>\d+)[ \t]*(?P<fs>\d*\.?\d*)/*(?P<counter_freq>-?\d*\.?\d*)
+    \(?(?P<base_counter>-?\d*\.?\d*)\)?[ \t]*(?P<sig_len>\d*)[ \t]*
+    (?P<base_time>\d{,2}:?\d{,2}:?\d{,2}\.?\d{,6})[ \t]*
+    (?P<base_date>\d{,2}/?\d{,2}/?\d{,4})
+    ''', re.VERBOSE)
 
 # Signal line
-_rx_signal = re.compile(''.join(
-    ["[ \t]*",
-     "(?P<file_name>~?[-\w]*\.?[\w]*)[ \t]+(?P<fmt>\d+)x?"
-     "(?P<samps_per_frame>\d*):?(?P<skew>\d*)\+?(?P<byte_offset>\d*)[ \t]*",
-     "(?P<adc_gain>-?\d*\.?\d*e?[\+-]?\d*)\(?(?P<baseline>-?\d*)\)?",
-     "/?(?P<units>[\w\^\-\?%\/]*)[ \t]*(?P<adc_res>\d*)[ \t]*",
-     "(?P<adc_zero>-?\d*)[ \t]*(?P<init_value>-?\d*)[ \t]*(?P<checksum>-?\d*)",
-     "[ \t]*(?P<block_size>\d*)[ \t]*(?P<sig_name>[\S]?[^\t\n\r\f\v]*)"])
-)
+_rx_signal = re.compile(
+    r'''
+    [ \t]*
+    (?P<file_name>~?[-\w]*\.?[\w]*)[ \t]+(?P<fmt>\d+)x?
+    (?P<samps_per_frame>\d*):?(?P<skew>\d*)\+?(?P<byte_offset>\d*)[ \t]*
+    (?P<adc_gain>-?\d*\.?\d*e?[\+-]?\d*)\(?(?P<baseline>-?\d*)\)?
+    /?(?P<units>[\w\^\-\?%\/]*)[ \t]*(?P<adc_res>\d*)[ \t]*
+    (?P<adc_zero>-?\d*)[ \t]*(?P<init_value>-?\d*)[ \t]*(?P<checksum>-?\d*)
+    [ \t]*(?P<block_size>\d*)[ \t]*(?P<sig_name>[\S]?[^\t\n\r\f\v]*)
+    ''', re.VERBOSE)
 
 # Segment line
-_rx_segment = re.compile('[ \t]*(?P<seg_name>[-\w]*~?)[ \t]+(?P<seg_len>\d+)')
-
+_rx_segment = re.compile(
+    r'''
+    [ \t]*
+    (?P<seg_name>[-\w]*~?)[ \t]+(?P<seg_len>\d+)
+    ''', re.VERBOSE)
 
 class BaseHeaderMixin(object):
     """