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I have a folder with files named
How can I check if file "myfilethree" is present.
I mean is there another method other than IsFileExist() method, i.e like filename contains substring "three"?
718
Check if a string contains a sub-string in C++. Here we will see how the string library functions can be used to match strings in C++. Here we are using the find() operation to get the occurrences of the substring into the main string. This find() method returns the first location where the string is found.
The function takes two char pointer arguments, the first denoting the string to search in and the other denoting the string to search for. It finds the first starting address of the given substring and returns the corresponding pointer to char. If the substring is not found in the first argument string, the NULL pointer is returned.
A substring is itself a string that is part of a longer string. For example, substrings of string "the" are "" (empty string), "t", "th", "the", "h", "he" and "e."
Here we will see how the string library functions can be used to match strings in C++. Here we are using the find () operation to get the occurrences of the substring into the main string. This find () method returns the first location where the string is found. Here we are using this find () function multiple times to get all of the matches.
Substring:
bool contains = Directory.EnumerateFiles(path).Any(f => f.Contains("three"));
Case-insensitive substring:
bool contains = Directory.EnumerateFiles(path).Any(f => f.IndexOf("three", StringComparison.OrdinalIgnoreCase) > 0);
Case-insensitive comparison:
bool contains = Directory.EnumerateFiles(path).Any(f => String.Equals(f, "myfilethree", StringComparison.OrdinalIgnoreCase));
Get file names matching a wildcard criteria:
IEnumerable<string> files = Directory.EnumerateFiles(path, "three*.*"); // lazy file system lookup
string[] files = Directory.GetFiles(path, "three*.*"); // not lazy
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