Regular Expression | Matches |
---|---|
foo | The string “foo” |
^foo | “foo” at the start of a string |
foo$ | “foo” at the end of a string |
^foo$ | “foo” when it is alone on a string |
[abc] | a, b, or c |
[a-z] | Any lowercase letter |
[^A-Z] | Any character that is not a uppercase letter |
(gif | jpg) |
[a-z]+ | One or more lowercase letters |
[0-9.-] | A�ny number, dot, or minus sign |
^[a-zA-Z0-9_]{1,}$ | Any word of at least one letter, number or _ |
([wx])([yz]) | wy, wz, xy, or xz |
[^A-Za-z0-9] | Any symbol (not a number or a letter) |
([A-Z]{3} | [0-9]{4}) |
Function | Description |
---|---|
preg_match() | The preg_match() function searches string for pattern, returning true if pattern exists, and false otherwise. |
preg_match_all() | The preg_match_all() function matches all occurrences of pattern in string. |
preg_replace() | The preg_replace() function operates just like ereg_replace(), except that regular expressions can be used in the pattern and replacement input parameters. |
preg_split() | The preg_split() function operates exactly like split(), except that regular expressions are accepted as input parameters for pattern. |
preg_grep() | The preg_grep() function searches all elements of input_array, returning all elements matching the regexp pattern. |
preg_ quote() | Quote regular expression characters |