#原文:
#coding=utf-8 # regular.py 正则表达式 import re # 正则模块 def regular(): data = "She is more than pretty. 520" # --- 正则 --- reg = r"mo" # 指定字符 => span=(7,9),match=‘mo‘ reg = r"." # (.)单个字符 => span=(0,1),match=‘S‘ reg = r"\." # (\)转义符 => span=(23,24),match=‘.‘ reg = r"[.]" # ([])字符集合(注意:部分特殊字符失去特殊意义) => span=(23,match=‘.‘ reg = r"[love]" # []内任意字符 => span=(2,3),match=‘e‘ reg = r"[i-u]" # (-)范围 => span=(4,5),match=‘i‘ reg = r"t{2}" # {}内为长度(3个6) => span=(20,22),match=‘tt‘ reg = r"t{1,3}" # {M,} / {.N} / {N} => span=(12,13),match=‘t‘ reg = r"(i|o|u){1}" # (())组 => span=(4,match=‘i‘ reg = r"^S" # (^)开头 => span=(0,match=‘S‘ reg = r"[^S]" # ([^])取反(不含H) => span=(1,2),match=‘h‘ reg = r"520$" # ($)结尾 => span=(25,28),match=‘520‘ reg = r"et*" # (*)匹配{0,}个表达式 => [‘e‘,‘e‘,‘ett‘] reg = r"et+" # (+)匹配{1,}个表达式 => [‘ett‘] reg = r"et?" # (?)匹配{0,1}个表达式 => [‘e‘,‘et‘] reg = r".+?e" # (?)非贪婪模式(span=(0,20),match=‘She is more than pre‘ => span=(0,match=‘She‘) reg = r"\145" # ascii标的8进制数(145=101=e) => span=(2,match=‘e‘ reg = r"\d" # (\d)单个数字 => span=(25,26),match=‘5‘ (推荐:[0-9]) reg = r"\D" # (\D)非数字 => span=(0,match=‘S‘ (推荐:[^0-9]) reg = r"\s" # (\s)空白字符 => span=(3,4),match=‘ ‘ (推荐:[\t\n\r\f\v]) reg = r"\S" # (\S)非空白字符 => span=(0,match=‘S‘ (推荐:[^\t\n\r\f\v]) reg = r"\w" # (\w)单词 => span=(0,match=‘S‘ (推荐:[a-zA-Z0-9_]) reg = r"\W" # (\W)非单词 => span=(3,match=‘ ‘ (推荐:[^a-zA-Z0-9_]) reg = r"\AS" # (\A)开头 => span=(0,match=‘S‘ reg = r"520\Z" # (\Z)结尾 => span=(25,match=‘520‘ reg = r"y\b" # (\b)单词边界(Hello) => span=(22,23),match=‘y‘ reg = r"o\B" # (\B)非单词边界(world) => span=(8,match=‘o‘ reg = r"[01]\d\d|2[0-4]\d|25[0-5]" # 或(|) 多位数(匹配0 - 255 直接的数字) index = re.search(reg,data) # 查找单个匹配项 index = re.match(r"She",data) # 匹配开头 => span=(0,match=‘She‘ index = re.fullmatch(r".+",data) # 匹配全部 => span=(0,match=‘She is more than pretty. 520‘ lists = re.findall(reg,data) # 查找所有匹配项(列表) lists = re.split(r"o",data,maxsplit=1) # 根据正则分割字符串(maxsplit分割次数) => [‘She is m‘,‘re than pretty. 520‘] strs = re.sub(r"\.",r"!",count=1) # 替换(count:替换次数)(匹配替换,未匹配原样) => She is more than pretty! 520 re.purge() # 清除正则表达式缓存 # --- 正则表达式对象 --- pat = re.compile(r"e") # 编译成正则对象 # 匹配模式有(使用|组合): re.DEBUG / re.I(IGnorECASE)不区分大小写 / re.L(LOCALE) / re.M(MULTILINE) / re.S(DOTALL) 匹配任何字符,‘.‘含换行,没有此标志,‘.‘除换行符 / re.U(UNICODE) / re.X(VERBOSE) pat = re.compile(r"e",re.S|re.I) index = pat.search(data) # 查找单个匹配项 => span=(2,match=‘e‘ index = pat.search(data,5) # => span=(10,11),1,10) index = pat.match(data) # 匹配开头 => None index = pat.match(data,2) # => span=(2,match=‘e‘ index = pat.match(data,10) index = pat.fullmatch(data) # 匹配全部 => None index = pat.fullmatch(data,2) # => None index = pat.fullmatch(data,2,3) # span=(2,match=‘e‘ lists = pat.split(data,maxsplit=0) # 分割 => [‘Sh‘,‘ is mor‘,‘ than pr‘,‘tty. 520‘] lists = pat.findall(data) # 查找全部 => [‘e‘,‘e‘] lists = pat.findall(data,5) # => [‘e‘,10) # => [‘e‘] strs = pat.sub(r"o",count=0) # 替换 => Sho is moro than protty. 520 # --- Match --- match = index; # span=(2,match=‘e‘ strs = match.string # 被匹配的数据 => She is more than pretty. 520 strs = match.group() # 获取 match(匹配到的) 数据 => e pos = match.pos # 起始坐标 pos = match.endpos # 结束坐标 index.span()[0] # match(匹配到)的起始坐标 => 2 index.span()[1] # match的结束坐标 => 3 if __name__ == "__main__": regular()http://blog.csdn.net/Rozol/article/details/70052637
