grouping and greedy operations. : group « Regular Expressions « Python Tutorial






  1. Python Tutorial
  2. Regular Expressions
  3. group
import re

formatString1 = "%-22s: %s"   # string to format output 

testString1 = "phone: 123-4567, e-mail: a@server.com"
expression1 = r"(\w+ \w+), phone: (\d{3}-\d{4}), e-mail: (\w+@\w+\.\w{3})"

formatString2 = "%-38s: %s"   # string to format output

pathString = "/books/2001/python"  # file path string

expression2 = "(/.+)/"  # greedy operator expression
print formatString1 % ( "Greedy error",re.match( expression2, pathString ).group( 1 ) )

expression3 = "(/.+?)/"  # non-greedy operator expression
print formatString1 % ( "No error, base only",re.match( expression3, pathString ).group( 1 ) )








16.3.group
16.3.1.obtain a tuple of all the subgroups matched:
16.3.2.grouping and greedy operations.