Python Regular Expression summary (1)

Learn a python Regular expression for match,search,findall, A brief summary of Finditer and other functions

Here is an example of a python Regular expression using a Web page:

strhtml = "<div> <a href="/user/student/"class=" user-t "></a>                      </div>                                         </div>                  <div class = "Navbar-search-btn visible-xs visible-sm" >                    <a href= "/common/mobile/search/" class= "Sch" ></a>                  </div> ' Print strhtml# regular expression  matches such as:< a href= "xxxxx" class= "xxxx" Remod = Re.compile (r "<a href=\" ([^ \ "]*" \ "class=\" ([^\ "]*) \" ")

Example of search method

Search finds the first to find a matching string and returns

Item = Remod.search (strhtml) If item:    print Item.group () Else:    print "no match [Search]"     # output: # <a href= "/u ser/student/"class=" User-t "

Example of Match method

Match will find the first matching string from the beginning of the string and return

Item = Remod.match (strHTML, re. M|re. S)   If item:    print Item.group () else:print "no match [match]" no match [match] # output # no match [match]

FindAll Examples of methods

Findall Check Find all matching strings and return a list, if there is a matching group, then it is a tuple under this list

Items = Remod.findall (strhtml)   if items:    print items for    it in items:        print Itelse:    print "no match [ FindAll] "# output # [('/user/student/', ' user-t '), ('/common/mobile/search/', ' Sch ')]# ('/user/student/', ' User-t ') # ('/ common/mobile/search/', ' Sch ')

Finditer Examples of methods

Finditer Check Find all matching strings and return a groupthat can be referenced by subscript, starting with 1

tems = Remod.finditer (strhtml if items:    for it in items:        print "It.group ():", It.group ()        print "It.group (0): ", It.group (0)        print" It.group (1): ", It.group (1)        print" It.group (2): ", It.group (2) +" \ n "else:print" no match [ FindAll] "# output # It.group (): <a href="/user/student/"class=" User-t "# it.group (0): <a href="/user/student/"class=" User-t "# It.group (1):/user/student/# It.group (2): user-t# it.group (): <a href="/common/mobile/search/"class=" Sch " # it.group (0): <a href= "/common/mobile/search/" class= "Sch" # It.group (1):/common/mobile/search/# It.group (2): Sch

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Python Regular Expression summary (1)