preg_match如何返回匹配？

Question

According to PHP manual "If matches is provided, then it is filled with the results of search. $matches[0] will contain the text that matched the full pattern, $matches[1] will have the text that matched the first captured parenthesized subpattern, and so on."

How can I return a value from a string with only knowing the first few characters?

The string is dynamic and will always change whats inside, but the first four character will always be the same.

For example how could I return "Car" from this string "TmpsCar". The string will always have "Tmps" followed by something else.

From what I understand I can return using something like this

preg_match('/(Tmps+)/', $fieldName, $matches);

echo($matches[1]);

Should return "Car".

Answer 1

Your regex is flawed. Use this:

preg_match('/^Tmps(.+)$/', $fieldName, $matches);
echo($matches[1]);