You can capture the strings, then count them. It can be done by applying a list context to the capture with (): my $x = “foo”; my $y = “foo foo foo bar”; my $c = () = $y =~ /$x/g; # $c is now 3 You can also capture to an array and count … Read more
To see more details including working code, check my blog post at: http://www.leetcode.com/2010/11/finding-minimum-window-in-s-which.html To help illustrate this approach, I use an example: string1 = “acbbaca” and string2 = “aba”. Here, we also use the term “window”, which means a contiguous block of characters from string1 (could be interchanged with the term substring). i) string1 = … Read more
The only improvement I could think of is, to use list comprehension like this def get_all_substrings(input_string): length = len(input_string) return [input_string[i:j+1] for i in xrange(length) for j in xrange(i,length)] print get_all_substrings(‘abcde’) The timing comparison between, yours and mine def get_all_substrings(string): length = len(string) alist = [] for i in xrange(length): for j in xrange(i,length): alist.append(string[i:j … Read more
The second parameter in Substring is the length of the substring, not the end index (in other words, it’s not the length of the full string). You should probably include handling to check that it does indeed start with what you expect, end with what you expect, and is at least as long as you … Read more
You can bypass all the list operations with slicing: S = S[:1] + S[2:] or more generally S = S[:Index] + S[Index + 1:] Many answers to your question (including ones like this) can be found here: How to delete a character from a string using python?. However, that question is nominally about deleting by … Read more
Multiple ways, a selection: str=abc.out Shell: echo ${str%.*} Grep: echo $str | grep -o ‘^[^\.]*’ Sed: echo $str | sed -E ‘s/(.*?)\..*/\1/’ Awk: echo $str | awk -F. ‘{print $1}’ -F. means split the string by . and $1 means the first column. Cut: echo $str | cut -d. -f1 All output: abc
Found it. If anyone wants to know: {% if name.endswith(‘-p’) %} {{ name[:-2] }} {% else %} {{ name }} {% endif %}
Pattern matching doesn’t just work before the extension. Just as much as you can ignore *.txt, you can ignore: output*.txt