Handy Regex

gistfile1.txt

Regex Character	Explanation
#	Forces the server to ignore the text following the # on the same line. Typically used for comments
[F]	Indicates Forbidden, with this the server should return a 403 forbidden error to the client
[L]	The Last rule forces the server to stop processing rules in the .htaccess file
[N]	Indicates Next and forces Apache to redo the rewrite process, except using the currently rewritten URL instead of the initial URL
[G]	Gone tells the server to deliever the gone status message, which is used to mark pages that no longer exist on the site.
[R]	This forces Apache to initialize a redirect, this can be a permanent redirect (page has moved, 301), or a temporary redirect (302).
[P]	Indicates Proxy which tells the server to use mod_proxy to handle requests
[C]	Tells the server to chain a rule with the next rule. If the rule matches for example, then the chained rules will run as well, if not, then they will not run.
[QSA]	Tells the server to use the query string at the end of an expression
[NC]	No Case instructs the server to treat any argument as case insensitive
[NS]	The No Subrequest forces the server to skip if it is an internal sub request
[PT]	Pass Through has mod_rewrite send a formatted URL back to Apache
[NE]	No Escape forces the server to parse through all output ignoring escaping characters, meaning spaces in the URL will not be replaced with %20 for example
[OR]	Specifies a logical ‘OR‘ statement that evaluates two expressions
[S=x]	Forces the server to skip “x” number of rules based on if a match is found, not the same as the Chain flag [C]
[a-z]	Denotes a range of characters between the two characters separated by a dash
[^]	Defines not within a character class, or the Start of a string of characters
[]+	Defines that any combination characters defined within the brackets is a match there can be multiple matches
[]	Defines that any characters defined within the brackets is a match
[T=MIME-type]	Defines the mime type, forces the target file to be that mime type
[E=variableName:newValue]	Forces the server to set the environmental variable “variableName” to the value “newValue”
a{n}	Defines the specific number of the preceding character to be matched
?	Defines the preceding character as being optional
$	Signals the end of a regular expression
()	Can be used to group characters together
^	Signals the beginning of a regular expression
.	Specifies a single arbitrary character
–	Signals not to perform an action
!	Defines negation
+	Will match at least one preceding character
|	Logical ‘OR‘ operator
*	Wildcard that will match any occurrence of the preceding character
.	Signals an escaped literal period
Used to escape special characters
-d	Analyzes if a string exists within a directory
-f	Determines if a string is a preexisting file
-s	Tests for a non zero value