16 KiB
minimatch
A minimal matching utility.
This is the matching library used internally by npm.
It works by converting glob expressions into JavaScript RegExp
objects.
Usage
// hybrid module, load with require() or import
import { minimatch } from 'minimatch'
// or:
const { minimatch } = require('minimatch')
minimatch('bar.foo', '*.foo') // true!
minimatch('bar.foo', '*.bar') // false!
minimatch('bar.foo', '*.+(bar|foo)', { debug: true }) // true, and noisy!
Features
Supports these glob features:
- Brace Expansion
- Extended glob matching
- "Globstar"
**
matching - Posix character
classes,
like
[[:alpha:]]
, supporting the full range of Unicode characters. For example,[[:alpha:]]
will match against'é'
, though[a-zA-Z]
will not. Collating symbol and set matching is not supported, so[[=e=]]
will not match'é'
and[[.ch.]]
will not match'ch'
in locales wherech
is considered a single character.
See:
man sh
man bash
Pattern Matchingman 3 fnmatch
man 5 gitignore
Windows
Please only use forward-slashes in glob expressions.
Though windows uses either /
or \
as its path separator, only /
characters are used by this glob implementation. You must use
forward-slashes only in glob expressions. Back-slashes in patterns
will always be interpreted as escape characters, not path separators.
Note that \
or /
will be interpreted as path separators in paths on
Windows, and will match against /
in glob expressions.
So just always use /
in patterns.
UNC Paths
On Windows, UNC paths like //?/c:/...
or
//ComputerName/Share/...
are handled specially.
- Patterns starting with a double-slash followed by some
non-slash characters will preserve their double-slash. As a
result, a pattern like
//*
will match//x
, but not/x
. - Patterns staring with
//?/<drive letter>:
will not treat the?
as a wildcard character. Instead, it will be treated as a normal string. - Patterns starting with
//?/<drive letter>:/...
will match file paths starting with<drive letter>:/...
, and vice versa, as if the//?/
was not present. This behavior only is present when the drive letters are a case-insensitive match to one another. The remaining portions of the path/pattern are compared case sensitively, unlessnocase:true
is set.
Note that specifying a UNC path using \
characters as path
separators is always allowed in the file path argument, but only
allowed in the pattern argument when windowsPathsNoEscape: true
is set in the options.
Minimatch Class
Create a minimatch object by instantiating the minimatch.Minimatch
class.
var Minimatch = require('minimatch').Minimatch
var mm = new Minimatch(pattern, options)
Properties
-
pattern
The original pattern the minimatch object represents. -
options
The options supplied to the constructor. -
set
A 2-dimensional array of regexp or string expressions. Each row in the array corresponds to a brace-expanded pattern. Each item in the row corresponds to a single path-part. For example, the pattern{a,b/c}/d
would expand to a set of patterns like:[ [ a, d ] , [ b, c, d ] ]
If a portion of the pattern doesn't have any "magic" in it (that is, it's something like
"foo"
rather thanfo*o?
), then it will be left as a string rather than converted to a regular expression. -
regexp
Created by themakeRe
method. A single regular expression expressing the entire pattern. This is useful in cases where you wish to use the pattern somewhat likefnmatch(3)
withFNM_PATH
enabled. -
negate
True if the pattern is negated. -
comment
True if the pattern is a comment. -
empty
True if the pattern is""
.
Methods
-
makeRe()
Generate theregexp
member if necessary, and return it. Will returnfalse
if the pattern is invalid. -
match(fname)
Return true if the filename matches the pattern, or false otherwise. -
matchOne(fileArray, patternArray, partial)
Take a/
-split filename, and match it against a single row in theregExpSet
. This method is mainly for internal use, but is exposed so that it can be used by a glob-walker that needs to avoid excessive filesystem calls. -
hasMagic()
Returns true if the parsed pattern contains any magic characters. Returns false if all comparator parts are string literals. If themagicalBraces
option is set on the constructor, then it will consider brace expansions which are not otherwise magical to be magic. If not set, then a pattern likea{b,c}d
will returnfalse
, because neitherabd
noracd
contain any special glob characters.This does not mean that the pattern string can be used as a literal filename, as it may contain magic glob characters that are escaped. For example, the pattern
\\*
or[*]
would not be considered to have magic, as the matching portion parses to the literal string'*'
and would match a path named'*'
, not'\\*'
or'[*]'
. Theminimatch.unescape()
method may be used to remove escape characters.
All other methods are internal, and will be called as necessary.
minimatch(path, pattern, options)
Main export. Tests a path against the pattern using the options.
var isJS = minimatch(file, '*.js', { matchBase: true })
minimatch.filter(pattern, options)
Returns a function that tests its
supplied argument, suitable for use with Array.filter
. Example:
var javascripts = fileList.filter(minimatch.filter('*.js', { matchBase: true }))
minimatch.escape(pattern, options = {})
Escape all magic characters in a glob pattern, so that it will only ever match literal strings
If the windowsPathsNoEscape
option is used, then characters are
escaped by wrapping in []
, because a magic character wrapped in
a character class can only be satisfied by that exact character.
Slashes (and backslashes in windowsPathsNoEscape
mode) cannot
be escaped or unescaped.
minimatch.unescape(pattern, options = {})
Un-escape a glob string that may contain some escaped characters.
If the windowsPathsNoEscape
option is used, then square-brace
escapes are removed, but not backslash escapes. For example, it
will turn the string '[*]'
into *
, but it will not turn
'\\*'
into '*'
, because \
is a path separator in
windowsPathsNoEscape
mode.
When windowsPathsNoEscape
is not set, then both brace escapes
and backslash escapes are removed.
Slashes (and backslashes in windowsPathsNoEscape
mode) cannot
be escaped or unescaped.
minimatch.match(list, pattern, options)
Match against the list of files, in the style of fnmatch or glob. If nothing is matched, and options.nonull is set, then return a list containing the pattern itself.
var javascripts = minimatch.match(fileList, '*.js', { matchBase: true })
minimatch.makeRe(pattern, options)
Make a regular expression object from the pattern.
Options
All options are false
by default.
debug
Dump a ton of stuff to stderr.
nobrace
Do not expand {a,b}
and {1..3}
brace sets.
noglobstar
Disable **
matching against multiple folder names.
dot
Allow patterns to match filenames starting with a period, even if the pattern does not explicitly have a period in that spot.
Note that by default, a/**/b
will not match a/.d/b
, unless dot
is set.
noext
Disable "extglob" style patterns like +(a|b)
.
nocase
Perform a case-insensitive match.
nocaseMagicOnly
When used with {nocase: true}
, create regular expressions that
are case-insensitive, but leave string match portions untouched.
Has no effect when used without {nocase: true}
Useful when some other form of case-insensitive matching is used, or if the original string representation is useful in some other way.
nonull
When a match is not found by minimatch.match
, return a list containing
the pattern itself if this option is set. When not set, an empty list
is returned if there are no matches.
magicalBraces
This only affects the results of the Minimatch.hasMagic
method.
If the pattern contains brace expansions, such as a{b,c}d
, but
no other magic characters, then the Minipass.hasMagic()
method
will return false
by default. When this option set, it will
return true
for brace expansion as well as other magic glob
characters.
matchBase
If set, then patterns without slashes will be matched
against the basename of the path if it contains slashes. For example,
a?b
would match the path /xyz/123/acb
, but not /xyz/acb/123
.
nocomment
Suppress the behavior of treating #
at the start of a pattern as a
comment.
nonegate
Suppress the behavior of treating a leading !
character as negation.
flipNegate
Returns from negate expressions the same as if they were not negated. (Ie, true on a hit, false on a miss.)
partial
Compare a partial path to a pattern. As long as the parts of the path that are present are not contradicted by the pattern, it will be treated as a match. This is useful in applications where you're walking through a folder structure, and don't yet have the full path, but want to ensure that you do not walk down paths that can never be a match.
For example,
minimatch('/a/b', '/a/*/c/d', { partial: true }) // true, might be /a/b/c/d
minimatch('/a/b', '/**/d', { partial: true }) // true, might be /a/b/.../d
minimatch('/x/y/z', '/a/**/z', { partial: true }) // false, because x !== a
windowsPathsNoEscape
Use \\
as a path separator only, and never as an escape
character. If set, all \\
characters are replaced with /
in
the pattern. Note that this makes it impossible to match
against paths containing literal glob pattern characters, but
allows matching with patterns constructed using path.join()
and
path.resolve()
on Windows platforms, mimicking the (buggy!)
behavior of earlier versions on Windows. Please use with
caution, and be mindful of the caveat about Windows
paths.
For legacy reasons, this is also set if
options.allowWindowsEscape
is set to the exact value false
.
windowsNoMagicRoot
When a pattern starts with a UNC path or drive letter, and in
nocase:true
mode, do not convert the root portions of the
pattern into a case-insensitive regular expression, and instead
leave them as strings.
This is the default when the platform is win32
and
nocase:true
is set.
preserveMultipleSlashes
By default, multiple /
characters (other than the leading //
in a UNC path, see "UNC Paths" above) are treated as a single
/
.
That is, a pattern like a///b
will match the file path a/b
.
Set preserveMultipleSlashes: true
to suppress this behavior.
optimizationLevel
A number indicating the level of optimization that should be done to the pattern prior to parsing and using it for matches.
Globstar parts **
are always converted to *
when noglobstar
is set, and multiple adjascent **
parts are converted into a
single **
(ie, a/**/**/b
will be treated as a/**/b
, as this
is equivalent in all cases).
-
0
- Make no further changes. In this mode,.
and..
are maintained in the pattern, meaning that they must also appear in the same position in the test path string. Eg, a pattern likea/*/../c
will match the stringa/b/../c
but not the stringa/c
. -
1
- (default) Remove cases where a double-dot..
follows a pattern portion that is not**
,.
,..
, or empty''
. For example, the pattern./a/b/../*
is converted to./a/*
, and so it will match the path string./a/c
, but not the path string./a/b/../c
. Dots and empty path portions in the pattern are preserved. -
2
(or higher) - Much more aggressive optimizations, suitable for use with file-walking cases:- Remove cases where a double-dot
..
follows a pattern portion that is not**
,.
, or empty''
. Remove empty and.
portions of the pattern, where safe to do so (ie, anywhere other than the last position, the first position, or the second position in a pattern starting with/
, as this may indicate a UNC path on Windows). - Convert patterns containing
<pre>/**/../<p>/<rest>
into the equivalent<pre>/{..,**}/<p>/<rest>
, where<p>
is a a pattern portion other than.
,..
,**
, or empty''
. - Dedupe patterns where a
**
portion is present in one and omitted in another, and it is not the final path portion, and they are otherwise equivalent. So{a/**/b,a/b}
becomesa/**/b
, because**
matches against an empty path portion. - Dedupe patterns where a
*
portion is present in one, and a non-dot pattern other than**
,.
,..
, or''
is in the same position in the other. Soa/{*,x}/b
becomesa/*/b
, because*
can match againstx
.
While these optimizations improve the performance of file-walking use cases such as glob (ie, the reason this module exists), there are cases where it will fail to match a literal string that would have been matched in optimization level 1 or 0.
Specifically, while the
Minimatch.match()
method will optimize the file path string in the same ways, resulting in the same matches, it will fail when tested with the regular expression provided byMinimatch.makeRe()
, unless the path string is first processed withminimatch.levelTwoFileOptimize()
or similar. - Remove cases where a double-dot
platform
When set to win32
, this will trigger all windows-specific
behaviors (special handling for UNC paths, and treating \
as
separators in file paths for comparison.)
Defaults to the value of process.platform
.
Comparisons to other fnmatch/glob implementations
While strict compliance with the existing standards is a worthwhile goal, some discrepancies exist between minimatch and other implementations. Some are intentional, and some are unavoidable.
If the pattern starts with a !
character, then it is negated. Set the
nonegate
flag to suppress this behavior, and treat leading !
characters normally. This is perhaps relevant if you wish to start the
pattern with a negative extglob pattern like !(a|B)
. Multiple !
characters at the start of a pattern will negate the pattern multiple
times.
If a pattern starts with #
, then it is treated as a comment, and
will not match anything. Use \#
to match a literal #
at the
start of a line, or set the nocomment
flag to suppress this behavior.
The double-star character **
is supported by default, unless the
noglobstar
flag is set. This is supported in the manner of bsdglob
and bash 4.1, where **
only has special significance if it is the only
thing in a path part. That is, a/**/b
will match a/x/y/b
, but
a/**b
will not.
If an escaped pattern has no matches, and the nonull
flag is set,
then minimatch.match returns the pattern as-provided, rather than
interpreting the character escapes. For example,
minimatch.match([], "\\*a\\?")
will return "\\*a\\?"
rather than
"*a?"
. This is akin to setting the nullglob
option in bash, except
that it does not resolve escaped pattern characters.
If brace expansion is not disabled, then it is performed before any
other interpretation of the glob pattern. Thus, a pattern like
+(a|{b),c)}
, which would not be valid in bash or zsh, is expanded
first into the set of +(a|b)
and +(a|c)
, and those patterns are
checked for validity. Since those two are valid, matching proceeds.
Negated extglob patterns are handled as closely as possible to
Bash semantics, but there are some cases with negative extglobs
which are exceedingly difficult to express in a JavaScript
regular expression. In particular the negated pattern
<start>!(<pattern>*|)*
will in bash match anything that does
not start with <start><pattern>
. However,
<start>!(<pattern>*)*
will match paths starting with
<start><pattern>
, because the empty string can match against
the negated portion. In this library, <start>!(<pattern>*|)*
will not match any pattern starting with <start>
, due to a
difference in precisely which patterns are considered "greedy" in
Regular Expressions vs bash path expansion. This may be fixable,
but not without incurring some complexity and performance costs,
and the trade-off seems to not be worth pursuing.
Note that fnmatch(3)
in libc is an extremely naive string comparison
matcher, which does not do anything special for slashes. This library is
designed to be used in glob searching and file walkers, and so it does do
special things with /
. Thus, foo*
will not match foo/bar
in this
library, even though it would in fnmatch(3)
.