diff options
Diffstat (limited to 'doc/string.n')
| -rw-r--r-- | doc/string.n | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/doc/string.n b/doc/string.n index 1d342a0..d0cb8d8 100644 --- a/doc/string.n +++ b/doc/string.n @@ -5,7 +5,7 @@ .\" See the file "license.terms" for information on usage and redistribution .\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. .\" -.\" RCS: @(#) $Id: string.n,v 1.43 2007/12/13 15:22:33 dgp Exp $ +.\" RCS: @(#) $Id: string.n,v 1.44 2008/06/29 22:28:24 dkf Exp $ .\" .so man.macros .TH string n 8.1 Tcl "Tcl Built-In Commands" @@ -16,13 +16,13 @@ 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 bytelength \fIstring\fR +. Returns a decimal string giving the number of bytes used to represent \fIstring\fR in memory. Because UTF\-8 uses one to three bytes to represent Unicode characters, the byte length will not be the same as @@ -33,6 +33,7 @@ Tcl ByteArray object). Refer to the \fBTcl_NumUtfChars\fR manual entry for more details on the UTF\-8 representation. .TP \fBstring compare\fR ?\fB\-nocase\fR? ?\fB\-length int\fR? \fIstring1 string2\fR +. Perform a character-by-character comparison of strings \fIstring1\fR and \fIstring2\fR. Returns \-1, 0, or 1, depending on whether \fIstring1\fR is lexicographically less than, equal to, or greater @@ -42,6 +43,7 @@ first \fIlength\fR characters are used in the comparison. If specified, then the strings are compared in a case-insensitive manner. .TP \fBstring equal\fR ?\fB\-nocase\fR? ?\fB\-length int\fR? \fIstring1 string2\fR +. Perform a character-by-character comparison of strings \fIstring1\fR and \fIstring2\fR. Returns 1 if \fIstring1\fR and \fIstring2\fR are identical, or 0 when not. If \fB\-length\fR is specified, then only @@ -50,6 +52,7 @@ the first \fIlength\fR characters are used in the comparison. If specified, then the strings are compared in a case-insensitive manner. .TP \fBstring first \fIneedleString haystackString\fR ?\fIstartIndex\fR? +. Search \fIhaystackString\fR for a sequence of characters that exactly match the characters in \fIneedleString\fR. If found, return the index of the first character in the first such match within \fIhaystackString\fR. If not @@ -69,10 +72,10 @@ will return \fB\-1\fR. .RE .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. \fIcharIndex\fR may be specified as follows: -.VS 8.5 .RS .IP \fIinteger\fR 10 For any index value that passes \fBstring is integer -strict\fR, @@ -121,9 +124,9 @@ leading whitespace. If \fIcharIndex\fR is less than 0 or greater than or equal to the length of the string then this command returns an empty string. .RE -.VE .TP \fBstring is \fIclass\fR ?\fB\-strict\fR? ?\fB\-failindex \fIvarname\fR? \fIstring\fR +. Returns 1 if \fIstring\fR is a valid member of the specified character class, otherwise returns 0. If \fB\-strict\fR is specified, then an empty string returns 0, otherwise an empty string will return 1 on @@ -179,12 +182,10 @@ Any of the forms allowed to \fBTcl_GetBoolean\fR where the value is true. .IP \fBupper\fR 12 Any upper case alphabet character in the Unicode character set. -.VS 8.5 .IP \fBwideinteger\fR 12 Any of the valid forms for a wide integer in Tcl, with optional surrounding whitespace. In case of under/overflow in the value, 0 is returned and the \fIvarname\fR will contain \-1. -.VE 8.5 .IP \fBwordchar\fR 12 Any Unicode word character. That is any alphanumeric character, and any Unicode connector punctuation characters (e.g. underscore). @@ -197,6 +198,7 @@ function will return 0, then the \fIvarname\fR will always be set to .RE .TP \fBstring last \fIneedleString haystackString\fR ?\fIlastIndex\fR? +. Search \fIhaystackString\fR for a sequence of characters that exactly match the characters in \fIneedleString\fR. If found, return the index of the first character in the last such match within \fIhaystackString\fR. If there @@ -216,6 +218,7 @@ will return \fB1\fR. .RE .TP \fBstring length \fIstring\fR +. Returns a decimal string giving the number of characters in \fIstring\fR. Note that this is not necessarily the same as the number of bytes used to store the string. If the object is a @@ -223,6 +226,7 @@ ByteArray object (such as those returned from reading a binary encoded channel), then this will return the actual byte length of the object. .TP \fBstring map\fR ?\fB\-nocase\fR? \fImapping string\fR +. Replaces substrings in \fIstring\fR based on the key-value pairs in \fImapping\fR. \fImapping\fR is a list of \fIkey value key value ...\fR as in the form returned by \fBarray get\fR. Each instance of a @@ -249,6 +253,7 @@ it will return the string \fB02c322c222c\fR. .RE .TP \fBstring match\fR ?\fB\-nocase\fR? \fIpattern\fR \fIstring\fR +. See if \fIpattern\fR matches \fIstring\fR; return 1 if it does, 0 if it does not. If \fB\-nocase\fR is specified, then the pattern attempts to match against the string in a case insensitive manner. For the two @@ -282,6 +287,7 @@ the special interpretation of the characters \fB*?[]\e\fR in .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 @@ -293,9 +299,11 @@ equal to the length of the string then it is treated as if it were string is returned. .TP \fBstring repeat \fIstring count\fR +. Returns \fIstring\fR repeated \fIcount\fR number of times. .TP \fBstring replace \fIstring first last\fR ?\fInewstring\fR? +. Removes 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 @@ -307,14 +315,14 @@ 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 or the length of the initial string, or \fIlast\fR is less than 0, then the initial string is returned untouched. -.VS 8.5 .TP \fBstring reverse \fIstring\fR +. Returns a string that is the same length as \fIstring\fR but with its characters in the reverse order. -.VE 8.5 .TP \fBstring tolower \fIstring\fR ?\fIfirst\fR? ?\fIlast\fR? +. Returns a value equal to \fIstring\fR except that all upper (or title) case letters have been converted to lower case. If \fIfirst\fR is specified, it refers to the first char index in the string to start @@ -323,6 +331,7 @@ the string to stop at (inclusive). \fIfirst\fR and \fIlast\fR may be specified as for the \fBindex\fR method. .TP \fBstring totitle \fIstring\fR ?\fIfirst\fR? ?\fIlast\fR? +. Returns a value equal to \fIstring\fR except that the first character in \fIstring\fR is converted to its Unicode title case variant (or upper case if there is no title case variant) and the rest of the @@ -333,6 +342,7 @@ stop at (inclusive). \fIfirst\fR and \fIlast\fR may be specified as for the \fBindex\fR method. .TP \fBstring toupper \fIstring\fR ?\fIfirst\fR? ?\fIlast\fR? +. Returns a value equal to \fIstring\fR except that all lower (or title) case letters have been converted to upper case. If \fIfirst\fR is specified, it refers to the first char index in the string to start @@ -341,24 +351,28 @@ the string to stop at (inclusive). \fIfirst\fR and \fIlast\fR may be specified as for the \fBindex\fR method. .TP \fBstring trim \fIstring\fR ?\fIchars\fR? +. Returns a value equal to \fIstring\fR except that any leading or trailing characters present in the string 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 present in the string 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 present in the string 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 charIndex\fR +. Returns the index of the character just after the last one in the word containing character \fIcharIndex\fR of \fIstring\fR. \fIcharIndex\fR may be specified as for the \fBindex\fR method. A word is @@ -367,6 +381,7 @@ or decimal digits) or underscore (Unicode connector punctuation) characters, or any single character other than these. .TP \fBstring wordstart \fIstring charIndex\fR +. Returns the index of the first character in the word containing character \fIcharIndex\fR of \fIstring\fR. \fIcharIndex\fR may be specified as for the \fBindex\fR method. A word is considered to be any @@ -374,6 +389,7 @@ contiguous range of alphanumeric (Unicode letters or decimal digits) or underscore (Unicode connector punctuation) characters, or any single character other than these. .SH EXAMPLE +.PP Test if the string in the variable \fIstring\fR is a proper non-empty prefix of the string \fBfoobar\fR. .CS @@ -384,14 +400,11 @@ if {$length == 0} { set isPrefix [\fBstring equal\fR -length $length $string "foobar"] } .CE - .SH "SEE ALSO" expr(n), list(n) - .SH KEYWORDS case conversion, compare, index, match, pattern, string, word, equal, ctype, character, reverse - .\" Local Variables: .\" mode: nroff .\" End: |