Method # 1: Using the naive method
| # Python code for demo
# to get the numeric prefix in the string
# if present
# initialization string ini_string = " 123abcjw " ini_string2 = "abceddfgh"
# print string and its length print ( "initial string:" , ini_string, ini_string2)
# code to find a numeric prefix in a string res1 = ’ ’ .join (c for c in ini_string if c in ’ 0123456789 ’) res2 = ’ ’ .join (c for c in ini_string2 if c in ’ 0123456789 ’)
# print the resulting string print ( " first string result: " , str (res1)) print ( "second string result:" , str (res2)) |
Output:
initial string: 123abcjw abceddfgh first string result: 123 second string result:
Method # 2: Using takewhile
| # Python code for demonstration
# to get a numeric prefix in line
# if present from itertools import takewhile
# initializing string ini_string = "123abcjw" ini_string2 = " abceddfgh "
# print line and its length print ( "initial string:" , ini_string, ini_string2)
# code to find a numeric prefix in a string res1 = ’’ .join (takewhile ( str . isdigit, ini_string)) res2 = ’’ .join (takewhile ( str . isdigit, ini_string2))
# print the resulting string print ( "first string result:" , res1) print ( "second string result:" , res2) |
Output:
initial string: 123abcjw abceddfgh first string result: 123 second string result:
Method # 3: Using re.sub
| # Python code for demonstration
# to get a numeric prefix in a string
# if submit import re < / p>
# initialization string ini_string = " 123abcjw " ini_string2 = "abceddfgh"
# print string and its length print ( "initial string:" , ini_string, ini_string2)
# code to find a numeric prefix in a string res1 = re.sub ( ’ D. * ’ , ’’, ini_string) res2 = re.sub ( ’D. *’ , ’’, ini_string2)
# print the resulting string print ( " first string result: " , str (res1)) print ( "second string result: " , str (res2)) |
Exit:
initial string: 123abcjw abceddfgh first string result: 123 second string result:
Using method # 4: Using re.findall
| # Python code for demo
# to get a numeric prefix in a string
# if submitted import re
# initialization string ini_string = "123abcjw" ini_string2 = "abceddfgh "
# print line and its length print ( "initial string:" , ini_string, ini_string2)
res1 = ’ ’ .join (re.findall (’ d + ’, ini_string)) res2 = ’ ’ .join (re.findall (’ d + ’, ini_string2))
# print the resulting string print ( "first string result:" , str (res1)) print ( "second s tring result: " , str (res2)) |
Exit:
initial string: 123abcjw abceddfgh first string result: 123 second string result:
