Syntax :
str.find (sub, start, end)
Parameters:
sub: It's the substring which needs to be searched in the given string.
start: Starting position where sub is needs to be checked within the string.
end: Ending position where suffix is needs to be checked within the string.
NOTE. If no start and end indexes are provided, then it defaults to 0 and length-1 as start and end indices, where end indices are not included in our search.
Return:
Returns the highest index of the substring inside the string if substring is found. Otherwise it raises an exception.
Examples :
input: text = 'geeks for geeks' result = text.rindex (' geeks ') output: 10 input: text =' geeks for geeks' result = text.rindex ('ge') output: 10 Errors and exceptions:
ValueError : This error occurs when no argument string is found in the target string.
CODE 1
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Error:
Traceback (most recent call last): File "/ home / da dc555d90806cae90a29998ea5d6266.py ", line 6, in result = text.rindex (' pawan') ValueError: substring not found CODE 3
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Output:
10 0
s = "123123STRINGabcabc"
def find_between( s, first, last ):
try:
start = s.index( first ) + len( first )
end = s.index( last, start )
return s[start:end]
except ValueError:
return ""
def find_between_r( s, first, last ):
try:
start = s.rindex( first ) + len( first )
end = s.rindex( last, start )
return s[start:end]
except ValueError:
return ""
print find_between( s, "123", "abc" )
print find_between_r( s, "123", "abc" )
gives:
123STRING
STRINGabc
I thought it should be noted - depending on what behavior you need, you can mix index and rindex calls or go with one of the above versions (it"s equivalent of regex (.*) and (.*?) groups).