MATCH questions

`String.prototype.match` retrieves the matches of a string against a regular expression. It returns an array of matches or `null` if no matches are found. 

const str = 'hello 123';
const matches = str.match(/\d+/);
console.log(matches); // ['123']

`String.prototype.search` searches a string for a match against a regular expression and returns the index of the first match. If no match is found, it returns -1. 

const str = 'hello 123'; 
const index = str.search(/\d+/); 
console.log(index); // 6 

The `preg_match()` function in PHP performs a regular expression match. It searches a string for a pattern defined by a regular expression and returns `1` if the pattern matches, `0` if it does not, or `FALSE` on error. For example: `preg_match('/\d+/', '123abc');` will return `1` because '123' matches the pattern of one or more digits. It is used for pattern matching and validation.

An API Version Mismatch error occurs when the client and server are using incompatible API versions. Ensure that both client and server are using the same version of the API, update versions as needed, and consult API documentation to manage version compatibility and avoid mismatches.

An Invalid Path Variable error occurs when a path variable in a URL does not match the expected format or value. Verify that path variables are correctly formatted and correspond to the expected values in routing configurations. Implement validation to ensure that variables meet expected criteria.

An Invalid Content-Type error occurs when the Content-Type header in a request does not match the expected type, such as sending JSON data with an incorrect Content-Type. Ensure that the Content-Type header is correctly set to match the request payload and validate it on the server side to handle data appropriately.