Regular Expression Will match…

Regular Expression     Will match…

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\.\-]                  any 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

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