blob: ef515c6ab22e39b402bf81c8e043d20f08e9916f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
<html><head><title>XLISP string/=</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>string/=</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlstr.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(string/= <i>string1 string2</i> [<i>key offset</i>] ... )</dt>
<dd><i>stringN</i> - a string expression<br>
<i>key</i> - a keyword [one of :start1 :start2 :end1 :end2]<br>
<i>offset</i> - an optional integer expression for a keyword<br>
returns - a non-<a href="nil.htm">NIL</a> value if <i>string1</i>
is not equal to <i>string2</i>,
<a href="nil.htm">NIL</a> otherwise<br>
<b>Note:</b> case is significant with this function</dd>
</dl>
<h2>Description</h2>
<p>The 'string/=' [string-not-equal] function takes two string arguments. A
non-<a href="nil.htm">NIL</a> value is returned if 'string1' is
not equal to 'string2', otherwise
<a href="nil.htm">NIL</a> is returned. The
non-<a href="nil.htm">NIL</a> value returned is the integer index
of the first character of 'string1' which is
<a href="char-not-equal-s.htm">char/=</a> [char-not-equal] to the
corresponding character of 'string2'.
This test is case sensitive, the character '#\a' is different and of greater
<a href="../misc/ascii-table.htm">ASCII</a> value than '#\A'.</p>
<p>The keyword arguments allow for accessing substrings within 'string1' and
'string2'. The keyword arguments each require a keyword ':start1', ':end1',
':start2' or ':end2' and a single integer expression as a pair with the
keyword first and the integer second. The pairs may be in any order. The
':startN' keywords specify the starting offset of the substring. A value of
0 starts the string at the beginning [no offset]. The ':endN' keywords
specify the ending offset of the substring. A value of 3 ends the string
after the 3rd character [an offset of 3 characters].</p>
<h2>Examples</h2>
<pre class="example">
(string/= "a" "b") <font color="#008844">; returns 0</font>
(string/= "a" "a") <font color="#008844">; returns NIL</font>
(string/= "a" "A") <font color="#008844">; returns 0</font>
(string/= "A" "a") <font color="#008844">; returns 0</font>
(string/= "abc" "abc ") <font color="#008844">; returns 3</font>
(string/= "J Smith" "K Smith" :start1 1 :start2 1) <font color="#008844">; returns NIL</font>
(string/= "abc" "123456789" :end2 3 :end1 3) <font color="#008844">; returns 0</font>
</pre>
<p><b>Note:</b> Be sure that the 'string/=' function is properly typed in.
The '/' is a forward slash. It is possible to mistakenly type a '\'
backslash. This is especially easy because the character mechanism is '#\a'.
If you do use the backslash, no error will be reported because backslash is
the single escape character and the XLISP reader will evaluate 'string\=' as
'string='. No error will be reported, but the sense of the test is
reversed.</p>
<p>See the
<a href="../manual/xlisp-man-025.htm#string-not-equal">string/=</a>
function in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
<hr>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
</body></html>
|
