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lsearch(n) Tcl Built-In Commands lsearch(n)
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NAME
lsearch - See if a list contains a particular element
SYNOPSIS
lsearch ?options? list pattern
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DESCRIPTION
This command searches the elements of list to see if one of them matches pattern. If so, the command
returns the index of the first matching element (unless the options -all or -inline are specified.)
If not, the command returns -1. The option arguments indicates how the elements of the list are to
be matched against pattern and must have one of the values below:
MATCHING STYLE OPTIONS
If all matching style options are omitted, the default matching style is -glob. If more than one
matching style is specified, the last matching style given takes precedence.
-exact Pattern is a literal string that is compared for exact equality against each list element.
-glob Pattern is a glob-style pattern which is matched against each list element using the same
rules as the string match command.
-regexp
Pattern is treated as a regular expression and matched against each list element using the
rules described in the re_syntax reference page.
-sorted
The list elements are in sorted order. If this option is specified, lsearch will use a more
efficient searching algorithm to search list. If no other options are specified, list is
assumed to be sorted in increasing order, and to contain ASCII strings. This option is mutu-ally mutually
ally exclusive with -glob and -regexp, and is treated exactly like -exact when either -all or
-not are specified.
GENERAL MODIFIER OPTIONS
These options may be given with all matching styles.
-all Changes the result to be the list of all matching indices (or all matching values if -inline
is specified as well.) If indices are returned, the indices will be in numeric order. If val-ues values
ues are returned, the order of the values will be the order of those values within the input
list.
-inline
The matching value is returned instead of its index (or an empty string if no value matches.)
If -all is also specified, then the result of the command is the list of all values that
matched.
-not This negates the sense of the match, returning the index of the first non-matching value in
the list.
-start index
The list is searched starting at position index. The interpretation of the index value is the |
same as for the command string index, supporting simple index arithmetic and indices relative |
to the end of the list.
CONTENTS DESCRIPTION OPTIONS
These options describe how to interpret the items in the list being searched. They are only meaning-ful meaningful
ful when used with the -exact and -sorted options. If more than one is specified, the last one takes
precedence. The default is -ascii.
-ascii The list elements are to be examined as Unicode strings (the name is for backward-compatibil-ity backward-compatibility
ity reasons.)
-dictionary
The list elements are to be compared using dictionary-style comparisons (see lsort for a
fuller description). Note that this only makes a meaningful difference from the -ascii option
when the -sorted option is given, because values are only dictionary-equal when exactly equal.
-integer
The list elements are to be compared as integers. |
-nocase ||
Causes comparisons to be handled in a case-insensitive manner. Has no effect if combined with |
the -dictionary, -integer, or -real options.
-real The list elements are to be compared as floating-point values.
SORTED LIST OPTIONS
These options (only meaningful with the -sorted option) specify how the list is sorted. If more than
one is given, the last one takes precedence. The default option is -increasing.
-decreasing
The list elements are sorted in decreasing order. This option is only meaningful when used
with -sorted.
-increasing
The list elements are sorted in increasing order. This option is only meaningful when used
with -sorted.
NESTED LIST OPTIONS
These options are used to search lists of lists. They may be used with any other options. |
-index indexList ||
This option is designed for use when searching within nested lists. The indexList argument |
gives a path of indices (much as might be used with the lindex or lset commands) within each |
element to allow the location of the term being matched against. |
-subindices ||
If this option is given, the index result from this command (or every index result when -all |
is also specified) will be a complete path (suitable for use with lindex or lset) within the |
overall list to the term found. This option has no effect unless the -index is also speci- |
fied, and is just a convenience short-cut.
EXAMPLES
Basic searching:
lsearch {a b c d e} c
-> 2
lsearch -all {a b c a b c} c
-> 2 5
Using lsearch to filter lists:
lsearch -inline {a20 b35 c47} b*
-> b35
lsearch -inline -not {a20 b35 c47} b*
-> a2_
lsearch -all -inline -not {a20 b35 c47} b*
-> a2_ c47
lsearch -all -not {a20 b35 c47} b*
-> _ 2
This can even do a "set-like" removal operation:
lsearch -all -inline -not -exact {a b c a d e a f g a} a
-> b c d e f g
Searching may start part-way through the list:
lsearch -start 3 {a b c a b c} c
-> 5
It is also possible to search inside elements:
lsearch -index 1 -all -inline {{a abc} {b bcd} {c cde}} *bc*
-> {a abc} {b bcd}
SEE ALSO
foreach(n), list(n), lappend(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n), lrange(n),
lreplace(n), string(n) |
KEYWORDS
list, match, pattern, regular expression, search, string
Tcl 8.5 lsearch(n)
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