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| Regular expressions are used in [[Filename_Filters|filename filters]] as a way to filter files on either the client or server side.
| | You are so awesome for hlepnig me solve this mystery. |
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| The flavor of regular expressions used are [http://en.wikipedia.org/wiki/Regular_expression#POSIX_Extended_Regular_Expressions POSIX extended regular expressions].
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| Note that by selecting "None of the following" as a [[Filename_Filters|file filter criteria type]], you can effectively select those files that ''do'' match the specified criteria.
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| = Regular Expressions Match Anywhere In The Name =
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| Unless anchored to the beginning or the end of the file name, they will match if they occur anywhere inside the file name. See the '^' and '$' characters.
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| Thus, if your regular expression is 'x', then any filename that contains the letter x anywhere will match (beginning, middle, or end).
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| = All Non-Special Characters =
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| All characters not specified below will match exactly in the filename. Thus, the regular expression 'foo' will match "foobar", "barfoo", and "quxfoobaz".
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| = The '.' Character =
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| The '.' character matches any single character. Thus, 'd.t' matches both "dat" and "dot".
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| = The '*' Character =
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| The '*' character matches 0 or more of the preceding token. Thus, 'foo.*bar' matches both "fooquxbar" and "foobar". The regular expression 'ge*k' matches "gk", "gek", "geek", and "geeeeeeeeeeeeeeeek".
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| = The '?' Character =
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| The '?' character matches 0 or 1 of the preceding token. Thus, 'gee?k' matches "gek" and "geek", but not "gk" or "geeek".
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| = The '^' Character =
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| The '^' character matches the beginning of the filename. Thus, '^x' matches all file whose names begin with the letter 'x'.
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| = The '$' Character =
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| The '$' character matches the end of the filename. Thus, 'x$' matches all files whose names end with the letter 'x'.
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| = The '\' Character =
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| This character escapes the following token, so that it does not take on special meaning. For example, if you wanted to filter for files that begin with a period, then the regular expression '^\.' would accomplish that for you. If you had just specified '^.', you would have matched all files that began with any single character.
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