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- '\"
- '\" Copyright (c) 1993 The Regents of the University of California.
- '\" Copyright (c) 1994-1995 Sun Microsystems, Inc.
- '\"
- '\" See the file "license.terms" for information on usage and redistribution
- '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- '\"
- '\" @(#) string.n 1.4 95/02/22 14:37:26
- '\"
- .so man.macros
- .HS string tcl 7.4
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- string \- Manipulate strings
- .SH SYNOPSIS
- \fBstring \fIoption arg \fR?\fIarg ...?\fR
- .BE
-
- .SH DESCRIPTION
- .PP
- Performs one of several string operations, depending on \fIoption\fR.
- The legal \fIoption\fRs (which may be abbreviated) are:
- .TP
- \fBstring compare \fIstring1 string2\fR
- Perform a character-by-character comparison of strings \fIstring1\fR and
- \fIstring2\fR in the same way as the C \fBstrcmp\fR procedure. Return
- \-1, 0, or 1, depending on whether \fIstring1\fR is lexicographically
- less than, equal to, or greater than \fIstring2\fR.
- .TP
- \fBstring first \fIstring1 string2\fR
- Search \fIstring2\fR for a sequence of characters that exactly match
- the characters in \fIstring1\fR. If found, return the index of the
- first character in the first such match within \fIstring2\fR. If not
- found, return \-1.
- .TP
- \fBstring index \fIstring charIndex\fR
- Returns the \fIcharIndex\fR'th character of the \fIstring\fR
- argument. A \fIcharIndex\fR of 0 corresponds to the first
- character of the string.
- If \fIcharIndex\fR is less than 0 or greater than
- or equal to the length of the string then an empty string is
- returned.
- .TP
- \fBstring last \fIstring1 string2\fR
- Search \fIstring2\fR for a sequence of characters that exactly match
- the characters in \fIstring1\fR. If found, return the index of the
- first character in the last such match within \fIstring2\fR. If there
- is no match, then return \-1.
- .TP
- \fBstring length \fIstring\fR
- Returns a decimal string giving the number of characters in \fIstring\fR.
- .TP
- \fBstring match \fIpattern\fR \fIstring\fR
- See if \fIpattern\fR matches \fIstring\fR; return 1 if it does, 0
- if it doesn't. Matching is done in a fashion similar to that
- used by the C-shell. For the two strings to match, their contents
- must be identical except that the following special sequences
- may appear in \fIpattern\fR:
- .RS
- .IP \fB*\fR 10
- Matches any sequence of characters in \fIstring\fR,
- including a null string.
- .IP \fB?\fR 10
- Matches any single character in \fIstring\fR.
- .IP \fB[\fIchars\fB]\fR 10
- Matches any character in the set given by \fIchars\fR. If a sequence
- of the form
- \fIx\fB\-\fIy\fR appears in \fIchars\fR, then any character
- between \fIx\fR and \fIy\fR, inclusive, will match.
- .IP \fB\e\fIx\fR 10
- Matches the single character \fIx\fR. This provides a way of
- avoiding the special interpretation of the characters
- \fB*?[]\e\fR in \fIpattern\fR.
- .RE
- .TP
- \fBstring range \fIstring first last\fR
- Returns a range of consecutive characters from \fIstring\fR, starting
- with the character whose index is \fIfirst\fR and ending with the
- character whose index is \fIlast\fR. An index of 0 refers to the
- first character of the string. \fILast\fR may be \fBend\fR (or any
- abbreviation of it) to refer to the last character of the string.
- If \fIfirst\fR is less than zero then it is treated as if it were zero, and
- if \fIlast\fR is greater than or equal to the length of the string then
- it is treated as if it were \fBend\fR. If \fIfirst\fR is greater than
- \fIlast\fR then an empty string is returned.
- .TP
- \fBstring tolower \fIstring\fR
- Returns a value equal to \fIstring\fR except that all upper case
- letters have been converted to lower case.
- .TP
- \fBstring toupper \fIstring\fR
- Returns a value equal to \fIstring\fR except that all lower case
- letters have been converted to upper case.
- .TP
- \fBstring trim \fIstring\fR ?\fIchars\fR?
- Returns a value equal to \fIstring\fR except that any leading
- or trailing characters from the set given by \fIchars\fR are
- removed.
- If \fIchars\fR is not specified then white space is removed
- (spaces, tabs, newlines, and carriage returns).
- .TP
- \fBstring trimleft \fIstring\fR ?\fIchars\fR?
- Returns a value equal to \fIstring\fR except that any
- leading characters from the set given by \fIchars\fR are
- removed.
- If \fIchars\fR is not specified then white space is removed
- (spaces, tabs, newlines, and carriage returns).
- .TP
- \fBstring trimright \fIstring\fR ?\fIchars\fR?
- Returns a value equal to \fIstring\fR except that any
- trailing characters from the set given by \fIchars\fR are
- removed.
- If \fIchars\fR is not specified then white space is removed
- (spaces, tabs, newlines, and carriage returns).
- .TP
- \fBstring wordend \fIstring index\fR
- .VS
- Returns the index of the character just after the last one in the
- word containing character \fIindex\fR of \fIstring\fR.
- A word is considered to be any contiguous range of alphanumeric
- or underscore characters, or any single character other than these.
- .TP
- \fBstring wordstart \fIstring index\fR
- Returns the index of the first character in the
- word containing character \fIindex\fR of \fIstring\fR.
- A word is considered to be any contiguous range of alphanumeric
- or underscore characters, or any single character other than these.
- .VE
-
- .SH KEYWORDS
- case conversion, compare, index, match, pattern, string, word
-