32 lines
6.2 KiB
Plaintext
32 lines
6.2 KiB
Plaintext
-->
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<span style="color: #000080;font-style:italic;">--(1) starting from n characters in and of m length;
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--(2) starting from n characters in, up to the end of the string;
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--(3) whole string minus last character;
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--(4) starting from a known character within the string and of m length;
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--(5) starting from a known substring within the string and of m length. </span>
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<span style="color: #008080;">constant</span> <span style="color: #000000;">sentence</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"the last thing the man said was the"</span><span style="color: #0000FF;">,</span>
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<span style="color: #000000;">n</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">10</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">m</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">5</span>
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<span style="color: #004080;">integer</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">l</span>
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<span style="color: #000000;">l</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">n</span><span style="color: #0000FF;">+</span><span style="color: #000000;">m</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
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<span style="color: #008080;">if</span> <span style="color: #000000;">l</span><span style="color: #0000FF;"><=</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
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<span style="color: #0000FF;">?</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">[</span><span style="color: #000000;">n</span><span style="color: #0000FF;">..</span><span style="color: #000000;">l</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- (1)</span>
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
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<span style="color: #008080;">if</span> <span style="color: #000000;">n</span><span style="color: #0000FF;"><=</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
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<span style="color: #0000FF;">?</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">[</span><span style="color: #000000;">n</span><span style="color: #0000FF;">..-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- (2) or [n..$]</span>
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
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<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">)></span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
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<span style="color: #0000FF;">?</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..-</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- (3) or [1..$-1]</span>
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
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<span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #008000;">'m'</span><span style="color: #0000FF;">,</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">)</span>
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<span style="color: #000000;">l</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">+</span><span style="color: #000000;">m</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
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<span style="color: #008080;">if</span> <span style="color: #000000;">l</span><span style="color: #0000FF;"><=</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
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<span style="color: #0000FF;">?</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">..</span><span style="color: #000000;">l</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- (4)</span>
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
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<span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">match</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"aid"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">)</span>
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<span style="color: #000000;">l</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">+</span><span style="color: #000000;">m</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
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<span style="color: #008080;">if</span> <span style="color: #000000;">l</span><span style="color: #0000FF;"><=</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
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<span style="color: #0000FF;">?</span><span style="color: #000000;">sentence</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">..</span><span style="color: #000000;">l</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- (5)</span>
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
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