python3 advanced regular expression re module

re module

1.match()method:

　　Determine whether it matches, if the match is successful, return an Matchobject, otherwise returnNone

#Example 1: 
test1= ' 012-12345678 '

if re.match(r ' ^\d{3}\-\d{3,8}$ ' ,test1):
     print ( 'yes ' )
 else :
     print ( ' failed ' ) 

#Output # 
yes #Description 

: ^ means start matching from the beginning of the line, $ means the end of the line, match 3 numbers plus - then 3-8 numbers