"little turtle" "Python" Regular Expression (ii)

1>>>ImportRE
The meaning of a #| or an expression2>>> Re.search (r"Fish (c| D)","FISHC")3<_sre. Sre_match object; span= (0, 5), match='FISHC'>4>>> Re.search (r"Fish (c| D)","Fishe")5>>> Re.search (r"^FISHC","Fish")6>>> Re.search (r"^FISHC","FISHC DFADF")7<_sre. Sre_match object; span= (0, 5), match='FISHC'>
What does the #^ say begin with?8>>> Re.search (r"^FISHC","I FISHC DFADF")
What does #$ say end with?9>>> Re.search (r"fishc$","I FISHC DFADF")Ten>>> Re.search (r"fishc$","I FISHC DFADFFISHC") one<_sre. Sre_match object; span= (+), match='FISHC'>
#表示查找回车 a>>> Re.search (r"[\ n]","I FISHC dfadffishc\n") -<_sre. Sre_match object; span= (+), match='\ n'>
#[^...] Indicates a lookup except ... Data outside the condition ->>> Re.search (r"[^a-z]","I FISHC dfadffishc\n") the<_sre. Sre_match object; span= (0, 1), match='I'>

#[^...] Indicates a lookup ... Condition of the data
 ->>> Re.search (r"[a-z^]","I FISHC dfadffishc\n")
 -<_sre. Sre_match object; span= (3, 4), match='I'>
 ->>> Re.findall (r"[a-z^]","I FISHC dfadffishc\n")
 +['I','s','h','D','F','a','D','F','I','s','h']
 ->>> Re.findall (r"[^a-z]","I FISHC dfadffishc\n")
 +['I',' ','F','C',' ','F','C','\ n']
 a #\1 means repeating once 
 at>>> Re.search (r"(fishc) \1","FISHCFISHC")
 -<_sre. Sre_match object; span= (0, ten), match='FISHCFISHC'>
 - #141 is a (decimal ASCII value of 97) value of octal binary 
 ->>> Re.search (r"(fishc) \141","FISHCFISHC")
 ->>> Re.search (r"(fishc) \141","FISHCFISHCA")
 -<_sre. Sre_match object; span= (5, one), match='FISHCA'>
 in>>> Re.search (r"(fishc) \060","FISHCFISHCA")
 ->>> Re.search (r"(fishc) \060","FishCFishC0")
 to<_sre. Sre_match object; span= (5, one), match='FishC0'>
 +>>> Re.search (r"\.","fishcfishc0.com")
 -<_sre. Sre_match object; span= (one, one), match='.'>
 the>>> Re.search (r"[.]","fishcfishc0.com")
 *<_sre. Sre_match object; span= (one, one), match='.'>
 $>>> Re.search (r"c*","fishcfishc0.com")
Panax Notoginseng<_sre. Sre_match object; span= (0, 0), match="'>
 - #* indicates repeated unlimited times 
 the>>> Re.search (r"(fishc) *","fishcfishc0.com")
 +<_sre. Sre_match object; span= (0, ten), match='FISHCFISHC'>
 a #+ means repeat 1 to infinity 
 the>>> Re.search (r"(fishc) +","fishcfishc0.com")
 +<_sre. Sre_match object; span= (0, ten), match='FISHCFISHC'>
 - #? Repeat 0 or 1 times 
 $>>> Re.search (r"(fishc)?","fishcfishc0.com")
 $<_sre. Sre_match object; span= (0, 5), match='FISHC'>
 ->>> s="" 
 ->>> Re.search (r"<.+>", S)
 the<_sre. Sre_match object; span= (0, match=),''>
 ->>> Re.search (r"<.+?>", S)
Wuyi<_sre. Sre_match object; span= (0, 6), match=''>

"little turtle" "Python" Regular Expression (ii)