Python text string beginning or ending match

python text string start or end match

Scene:

the beginning or end of a string matches, typically using a matching file type or URL

General use Startwith or Endwith

  >>>a=' http://blog.csdn.net/raylee2007 '
  >>>A.startswith (' http ')
True

Note: The parameters inside these two methods can be Str , or it can be a tuple, but not a list or a dictionary

  >>>a=' http://blog.csdn.net/raylee2007 '
  >>>A.startswith ((' http ',' FTP '))
True

If it is a list or dictionary, the error

  >>>a=' http://blog.csdn.net/raylee2007 '
  >>>A.startswith ([' http ',' FTP '])
Traceback (most recent):
File "", Line1, inch
A.startswith ([' http ',' FTP '])
  TypeError:StartsWith First arg must be strora tuple of STR, notList
  >>>

In fact, in addition to the above method, You can also use slices to do it, but the code doesn't look that good.

  >>>a=' http://blog.csdn.net/raylee2007 '
  >>>a[0:4]==' http '
True
  >>>

Of course, we can do it with regular expressions, but it's a bit more difficult to understand.

  >>>Import re
  >>>URL ='http://www.python.org'
  >>>Re.match (' http:|https:|ftp: ', URL)
  0, 5), match=' http: '>
  >>>Help (Re.match)
Help on function matchinch Module Re:
 
Match (pattern, string, flags=0)
Try To apply the pattern at the start of the string, returning
A match object,orNoneifNo match was found.
 
 >>>

Python text string beginning or ending match