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Học biểu thức chính qui trong php

My Code: Pattern    Usage >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)    Matches either "gif" or "jpeg" [a-z]+    One or more lowercase letters [0-9\.\-    ] Аny 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})    Matches three letters or four numbers Special Sequences \w - Any “word” character (a-z 0-9 _) \W - Any non “word” character \s - Whitespace (space, tab CRLF) \S - Any non whitepsace character \d - Digits (0-9) \D - Any non digit character . - (Period) – Any character except newline Meta Characters ^ -