[F] Forbidden: instructs the server to return a 403 Forbidden to the client.
[L] Last rule: instructs the server to stop rewriting after the preceding directive is processed.
[N] Next: instructs Apache to rerun the rewrite rule until all rewriting directives have been achieved.
[G] Gone: instructs the server to deliver Gone (no longer exists) status message.
[P] Proxy: instructs server to handle requests by mod_proxy
[C] Chain: instructs server to chain the current rule with the previous rule.
[R] Redirect: instructs Apache to issue a redirect, causing the browser to request the rewritten/modified URL.
[NC] No Case: defines any associated argument as case-insensitive. i.e., "NC" = "No Case".
[PT] Pass Through: instructs mod_rewrite to pass the rewritten URL back to Apache for further processing.
[OR] Or: specifies a logical "or" that ties two expressions together such that either one proving true will cause the associated rule to be applied.
[NE] No Escape: instructs the server to parse output without escaping characters.
[NS] No Subrequest: instructs the server to skip the directive if internal sub-request.
[QSA] Append Query String: directs server to add the query string to the end of the expression (URL).
[S=x] Skip: instructs the server to skip the next "x" number of rules if a match is detected.
[E=variable:value] Environmental Variable: instructs the server to set the environmental variable "variable" to "value".
[T=MIME-type] Mime Type: declares the mime type of the target resource.
[] specifies a character class, in which any character within the brackets will be a match. e.g., [xyz] will match either an x, y, or z.
[]+ character class in which any combination of items within the brackets will be a match. e.g., [xyz]+ will match any number of x’s, y’s, z’s, or any combination of these characters.
[^] specifies not within a character class. e.g., [^xyz] will match any character that is neither x, y, nor z.
[a-z] a dash (-) between two characters within a character class ([]) denotes the range of characters between them. e.g., [a-zA-Z] matches all lowercase and uppercase letters from a to z.
a{n} specifies an exact number, n, of the preceding character. e.g., x{3} matches exactly three x’s.
a{n,} specifies n or more of the preceding character. e.g., x{3,} matches three or more x’s.
a{n,m} specifies a range of numbers, between n and m, of the preceding character. e.g., x{3,7} matches three, four, five, six, or seven x’s.
() used to group characters together, thereby considering them as a single unit. e.g., (perishable)?press will match press, with or without the perishable prefix.
^ denotes the beginning of a regex (regex = regular expression) test string. i.e., begin argument with the proceeding character.
$ denotes the end of a regex (regex = regular expression) test string. i.e., end argument with the previous character.
? declares as optional the preceding character. e.g., monzas? will match monza or monzas, while mon(za)? will match either mon or monza. i.e., x? matches zero or one of x.
! declares negation. e.g., “!string” matches everything except “string”.
. a dot (or period) indicates any single arbitrary character.
- instructs “not to” rewrite the URL, as in “...domain.com.* - [F]”.
+ matches one or more of the preceding character. e.g., G+ matches one or more G’s, while "+" will match one or more characters of any kind.
* matches zero or more of the preceding character. e.g., use “.*” as a wildcard.
| declares a logical “or” operator. for example, (x|y) matches x or y.
\ escapes special characters ( ^ $ ! . * | ). e.g., use “\.” to indicate/escape a literal dot.
\. indicates a literal dot (escaped).
/* zero or more slashes.
.* zero or more arbitrary characters.
^$ defines an empty string.
^.*$ the standard pattern for matching everything.
[^/.] defines one character that is neither a slash nor a dot.
[^/.]+ defines any number of characters which contains neither slash nor dot.
http:// this is a literal statement — in this case, the literal character string, “http://”.
^domain.* defines a string that begins with the term “domain”, which then may be proceeded by any number of any characters.
^domain\.com$ defines the exact string “domain.com”.
-d tests if string is an existing directory
-f tests if string is an existing file
-s tests if file in test string has a non-zero value
Semoga Bermanfaat.
