PHP Preg_match method

The Preg_match method uses regular expressions to process a string, save the resulting result in an array object, Array[0] Save the string matching the entire positive expression, array[1] Save the first string enclosed in parentheses, and so on.

Preg_match string $pattern string $subject array &$matches$flags$offset = 0]])

The following code:

<? PHP $pattern = "/abc (Li|wang) .../"; $arr Array (); $ret Preg_match ($pattern$arr); Echo "ret=$ret\ n"; Var_dump ($arr);

The results of the operation are as follows:

Ret=1Array(2) {  [0] = =  string(9) "abc Li fi"  [1] = =   String(2) "Li"}

As above, we get the match the entire expression "abc Li fi" and the parentheses "Li"; if we want to get the position of each match object in the original string, we can use Preg_offset_capture.

<? PHP $pattern = "/abc (Li|wang) .../"; $arr Array (); $ret Preg_match ($pattern$arr, preg_offset_capture); Echo "ret=$ret\ n"; Var_dump ($arr);

Run, get

Ret=1Array(2) {  [0] = =  array(2) {    [0] = =    string (9) "abc Li fi"    [1] = =    int (3)  }  [1] = =  array (2) {    [0] = =    string(2) "Li"    [1] = =    int ( 7)  }}

Thus, the element under Array[i] becomes an array object, contains 2 elements, and the second is the position of the pattern in the original string.

Of course Preg_match can also pass the offset parameter, which indicates where to start the match from the original string.

PHP Preg_match method