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Text File | 1993-10-26 | 4.8 KB | 102 lines | [TEXT/$Tcl] |
-
- string option arg ?arg ...?
-
-
- DESCRIPTION
- Performs one of several string operations, depending on
- option. The legal options (which may be abbreviated) are:
-
- string compare string1 string2
- Perform a character-by-character comparison of strings
- string1 and string2 in the same way as the C strcmp
- procedure. Return -1, 0, or 1, depending on whether
- string1 is lexicographically less than, equal to, or
- greater than string2.
-
- string first string1 string2
- Search string2 for a sequence of characters that
- exactly match the characters in string1. If found,
- return the index of the first character in the first
- such match within string2. If not found, return -1.
-
- string index string charIndex
- Returns the charIndex'th character of the string argu-
- ment. A charIndex of 0 corresponds to the first char-
- acter of the string. If charIndex is less than 0 or
- greater than or equal to the length of the string then
- an empty string is returned.
-
- string last string1 string2
- Search string2 for a sequence of characters that
- exactly match the characters in string1. If found,
- return the index of the first character in the last
- such match within string2. If there is no match, then
- return -1.
-
- string length string
- Returns a decimal string giving the number of charac-
- ters in string.
-
- string match pattern string
- See if pattern matches string; 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 pattern:
-
- * Matches any sequence of characters in string,
- including a null string.
-
- ? Matches any single character in string.
-
- [chars] Matches any character in the set given by
- chars. If a sequence of the form x-y appears
- in chars, then any character between x and y,
- inclusive, will match.
-
- \x Matches the single character x. This pro-
- vides a way of avoiding the special interpre-
- tation of the characters *?[]\ in pattern.
-
- string range string first last
- Returns a range of consecutive characters from string,
- starting with the character whose index is first and
- ending with the character whose index is last. An
- index of 0 refers to the first character of the string.
- Last may be end (or any abbreviation of it) to refer to
- the last character of the string. If first is less
- than zero then it is treated as if it were zero, and if
- last is greater than or equal to the length of the
- string then it is treated as if it were end. If first
- is greater than last then an empty string is returned.
-
- string tolower string
- Returns a value equal to string except that all upper
- case letters have been converted to lower case.
-
- string toupper string
- Returns a value equal to string except that all lower
- case letters have been converted to upper case.
-
- string trim string ?chars?
- Returns a value equal to string except that any leading
- or trailing characters from the set given by chars are
- removed. If chars is not specified then white space is
- removed (spaces, tabs, newlines, and carriage returns).
-
- string trimleft string ?chars?
- Returns a value equal to string except that any leading
- characters from the set given by chars are removed. If
- chars is not specified then white space is removed
- (spaces, tabs, newlines, and carriage returns).
-
- string trimright string ?chars?
- Returns a value equal to string except that any trail-
- ing characters from the set given by chars are removed.
- If chars is not specified then white space is removed
- (spaces, tabs, newlines, and carriage returns).
-
-
- KEYWORDS
- case conversion, compare, index, match, pattern, string
-