Python正則表達式小結(1)

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學習一段python正則表達式了， 對match、search、findall、finditer等函數作一小結 

以下以一段網頁為例，用python正則表達式作一個範例：

strHtml = '''<div> <a href="/user/student/" class="user-t"><img src="/uploads/avatar/2015/06/082e408c-14fc-11e5-a98d-00163e02100b_big.jpg"></a>                      </div>                                         </div>                  <div class="navbar-search-btn visible-xs visible-sm">                    <a href="/common/mobile/search/" class="sch"></a>                  </div>'''print strHtml#正則表達式  匹配如：< a href=”xxxxx” class=”xxxx”remod = re.compile(r"<a href=\"([^\"]*)\" class=\"([^\"]*)\"")

search方法舉例

search 會尋找第一個找到匹配字串並返回

item = remod.search(strHtml) if item:    print item.group()else:    print "no match [search]"     # 輸出：# <a href="/user/student/" class="user-t"

match方法舉例

match 會從字串開頭匹配尋找第一個找到匹配字串並返回

item = remod.match(strHtml, re.M|re.S)   if item:    print item.group()else:print "no match [match]"no match [match] # 輸出# no match [match]

findall方法舉例

Findall查找全部找到匹配字串並返回一個列表，假設有匹配的組（group）,那麼它是這個列表下的一個元組

items = remod.findall(strHtml)   if items:    print items    for it in items:        print itelse:    print "no match [findall]"# 輸出# [('/user/student/', 'user-t'), ('/common/mobile/search/', 'sch')]# ('/user/student/', 'user-t')# ('/common/mobile/search/', 'sch')

finditer方法舉例

finditer查找全部找到匹配字串並返回一個group，能夠通過下標引用， 以下從1開始

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]"# 輸出# 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

Python正則表達式小結(1)