1.3 Regular expressions and Python language -1.3.7 match any single character

1.3.7 matches any single character (2018-05-08)

point number (. Cannot match a newline character \ n or a non-character, which means 　　 an empty string

　　search for a real period (decimal point) While we are using a backslash to escape the function of a period:

ImportRe#The dot (.) cannot match a newline character \ n or a non-char, that is, an empty string. Anyend ='. End'm= Re.match (Anyend,'Bend')#dot number matches ' B 'ifM is  notNone:Print("Match Success")    Print(M.group ())Else:    Print("Match failed")

Run result: Dot matches ' B ' match success

#The dot (.) cannot match a newline character \ n or a non-char, that is, an empty string. Anyend ='. End'm= Re.match (Anyend,'End')#does not match any charactersifM is  notNone:Print("Match Success")    Print(M.group ())Else:    Print("Match failed")

Run Result: Mismatched any character match failed

#The dot (.) cannot match a newline character \ n or a non-char, that is, an empty string. Anyend ='. End'm= Re.match (Anyend,'\nend')#any character other than \ nifM is  notNone:Print("Match Success")    Print(M.group ())Else:    Print("Match failed")

Run Result: any character match except \ n failed

#The dot (.) cannot match a newline character \ n or a non-char, that is, an empty string. Anyend ='. End'm= Re.search (Anyend,'The end.')#match "in Search"ifM is  notNone:Print("Search Success")    Print(M.group ())Else:    Print("Search Failed")

Run Result: Match "search success in Search"

#search for a real period (decimal point), and we escaped by using a backslash for the function of the period:patt314 ='3.14' #the point number that represents the regular expressionPi_patt ='3\.14' #the dot number that represents the literal (Dec. Point)m = Re.match (Pi_patt,'3.14')#Exact Match 3.14ifM is  notNone:Print("Match Success")    Print(M.group ())Else:    Print("Match failed")

Run Result: Exact Match 3.14 match succeeded

#search for a real period (decimal point), and we escaped by using a backslash for the function of the period:patt314 ='3.14' #the point number that represents the regular expressionPi_patt ='3\.14' #the dot number that represents the literal (Dec. Point)m = Re.match (patt314,'3014')#dot number match ' 0 'ifM is  notNone:Print("Match Success")    Print(M.group ())Else:    Print("Match failed")

Run Result: Dot match ' 0 ' match succeeded

#search for a real period (decimal point), and we escaped by using a backslash for the function of the period:patt314 ='3.14' #the point number that represents the regular expressionPi_patt ='3\.14' #the dot number that represents the literal (Dec. Point)m = Re.match (patt314,'3.14')#match dot number '. 'ifM is  notNone:Print("Match Success")    Print(M.group ())Else:    Print("Match failed")

Run Result: Dot match '. ' Match succeeded

#search for a real period (decimal point), and we escaped by using a backslash for the function of the period:patt314 ='3.14' #the point number that represents the regular expressionPi_patt ='3\.14' #the dot number that represents the literal (Dec. Point)m = Re.match (patt314,'3S14')#dot number match ' s 'ifM is  notNone:Print("Match Success")    Print(M.group ())Else:    Print("Match failed")

Run Result: Dot match ' s ' match succeeded

1.3 Regular expressions and Python language -1.3.7 match any single character