Regex empty string or email
This regex pattern will match an empty string: And this will match (crudely) an email or an empty string:
string
realloc(): invalid next size when reallocating to make space for strcat on char *
This error occurs because some other part of your code has corrupted the heap. We can’t tell you what that error is without seeing the rest of the code. The fact that FINE 7 is not printed tells you that realloc is failing. And that failure must be because buffer is invalid due to a heap corruption earlier in the execution. … Read more
enum to string in modern C++11 / C++14 / C++17 and future C++20
Magic Enum header-only library provides static reflection for enums (to string, from string, iteration) for C++17. For more examples check home repository https://github.com/Neargye/magic_enum. Where is the drawback? This library uses a compiler-specific hack (based on __PRETTY_FUNCTION__ / __FUNCSIG__), which works on Clang >= 5, MSVC >= 15.3 and GCC >= 9. Enum value must be in range [MAGIC_ENUM_RANGE_MIN, MAGIC_ENUM_RANGE_MAX]. By default MAGIC_ENUM_RANGE_MIN … Read more
String is immutable. What exactly is the meaning?
Before proceeding further with the fuss of immutability, let’s just take a look into the String class and its functionality a little before coming to any conclusion. This is how String works: This, as usual, creates a string containing “knowledge” and assigns it a reference str. Simple enough? Lets perform some more functions: Lets see how the below statement works: This appends a … Read more
Strip all non-numeric characters from string in JavaScript
Use the string’s .replace method with a regex of \D, which is a shorthand character class that matches all non-digits:
Convert string to decimal, keeping fractions
Hmm… I can’t reproduce this: Are you sure it’s not some other part of your code normalizing the decimal value later? Just in case it’s cultural issues, try this version which shouldn’t depend on your locale at all:
How can I check if a string contains ANY letters from the alphabet?
Regex should be a fast approach:
Python code to remove HTML tags from a string
Using a regex Using a regex, you can clean everything inside <> : Some HTML texts can also contain entities that are not enclosed in brackets, such as ‘&nsbm‘. If that is the case, then you might want to write the regex as This link contains more details on this. Using BeautifulSoup You could also use BeautifulSoup additional package to find … Read more
Meaning of #{ } in Ruby?
Why This Is a Good Question This is a tough question to Google for unless you know the right search terms. The #{} operator technically performs expression substitution inside a string literal. The Answer The #{} literal is the operator used for interpolation inside double-quoted strings the same way that the backticks or $() construct would be used in Bash. From a practical point of view, … Read more