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Count number of matches of a regex in Javascript
...r a generic way to count the number of occurrences of a regex pattern in a string, and don't want it to fail if there are zero occurrences, this code is what you need. Here's a demonstration:
/*
* Example
*/
const count = (str) => {
const re = /[a-z]{3}/g
return ((str || '').ma...
How can I check if a value is a json object?
...y server side code returns a value which is a json object on success and a string 'false' on failure. Now how can I check whether the returned value is a json object?
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How do you know a variable type in java?
...now whether it's an instance of a certain class:
boolean b = a instanceof String
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Javascript Regex: How to put a variable inside a regular expression?
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const regex = new RegExp(`ReGeX${testVar}ReGeX`);
...
string.replace(regex, "replacement");
Update
Per some of the comments, it's important to note that you may want to escape the variable if there is potential for malicious content (e.g. the variable comes from user input)
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How to extract extension from filename string in Javascript? [duplicate]
...n-capturing group, make it optional
$ # anchor to the end of the string
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What is the purpose of Rank2Types?
...y only use it as monomorphic. In the example map uses id as if it had type String -> String. And of course you can also pass a simple monomorphic function of the given type instead of id. Without rank2types there is no way for a function to require that its argument must be a polymorphic function...
How to declare Return Types for Functions in TypeScript
...he function. I showed what I was expecting in the code below : greet(name:string) :string {}
4 Answers
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HTML5 Local Storage fallback solutions [closed]
...()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else {
var expires = "";
}
if( this.localStoreSupport() ) {
localStorage.setItem(name, value);
}
else {
document.cookie = name+"=...
How to trim whitespace from a Bash variable?
...ming for you. It's one command/program, no parameters, returns the trimmed string, easy as that!
Note: this doesn't remove all internal spaces so "foo bar" stays the same; it does NOT become "foobar". However, multiple spaces will be condensed to single spaces, so "foo bar" will become "foo bar"...
How do I write a “tab” in Python?
... code:
f = open(filename, 'w')
f.write("hello\talex")
The \t inside the string is the escape sequence for the horizontal tabulation.
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