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<title>MultiRpelace Use Variables Option</title>
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<body>
<header>MultiReplace: "Use Variables" Feature Guide</header>
<main>
<div id=centershortlines></div>
<nav class=pagenav>
<a href="#Introduction">Introduction</a>
<a href="#FirstSteps">First steps</a>
<a href="#Variables">Variables</a>
<a href="#Commands">Commands</a>
<a href="#Operators"> Operators</a>
<a href="#IfThenLogic"> If-Then Logic</a>
<a href="#DebugOption"> Debug option</a>
<a href="#FurtherFunctions">Math & String Functions</a>
<a href="#Examples">Examples</a>
</nav>
<article>
<section id=Introduction>
<h2>Introduction</h2>
Activate the <strong>Use Variables</strong> checkbox to employ variables associated with specified strings, allowing for conditional and computational operations within the replacement string. This Dynamic Substitution is compatible with all search settings of Search Mode, Scope, and the other options. The functionality relies on the <a href="https://www.lua.org/" target="_blank">Lua engine</a>.
</section>
<section id=FirstSteps>
<h2>First step</h2>
Utilize either the <a href="#setstrorcalc"><code>set()</code></a> or <a href="#condcondition-trueval-falseval"><code>cond()</code></a> command in 'Replace with:' to channel the output as the replacement string. Only one of these commands should be used at a time.
</section>
<section id=Variables>
<h2>Variables</h2>
<table class="optionsTable">
<tr>
<th>Variable</th>
<th>Description</th>
</tr>
<tr>
<td><strong>CNT</strong></td>
<td>Count of the detected string.</td>
</tr>
<tr>
<td><strong>LINE</strong></td>
<td>Line number where the string is found.</td>
</tr>
<tr>
<td><strong>APOS</strong></td>
<td>Absolute character position in the document.</td>
</tr>
<tr>
<td><strong>LPOS</strong></td>
<td>Relative line position.</td>
</tr>
<tr>
<td><strong>LCNT</strong></td>
<td>Count of the detected string within the line.</td>
</tr>
<tr>
<td><strong>COL</strong></td>
<td>Column number where the string was found (CSV-Scope option selected).</td>
</tr>
<tr>
<td><strong>MATCH</strong></td>
<td>Contains the text of the detected string, in contrast to <code>CAP</code> variables which correspond to capture groups in regex patterns.</td>
</tr>
<tr>
<td><strong>CAP1</strong>, <strong>CAP2</strong>,...</td>
<td>These variables are equivalents to regex capture groups, designed for use in the 'Use Variables' environment. They are specifically suited for calculations and conditional operations within this environment. Although their counterparts ($1, $2, ...) cannot be used here.</td>
</tr>
<tr>
<td colspan="2"><strong>Decimal Separator:</strong> When <code>MATCH</code> and <code>CAP</code> variables are used to read numerical values for further calculations, both dot (.) and comma (,) can serve as decimal separators. However, these variables do not support the use of thousands separators.</td>
</tr>
</table>
</section>
<section id=Commands>
<h2>Commands</h2>
<h3 id="setstrorcalc">set(strOrCalc)</h3>
<p>Outputs strings or numbers directly.</p>
<table class="optionsTable">
<tr>
<th>Example</th>
<th>Result (assuming LINE = 5, CNT = 3)</th>
</tr>
<tr>
<td><code>set("replaceString"..CNT)</code></td>
<td>"replaceString3"</td>
</tr>
<tr>
<td><code>set(LINE+5)</code></td>
<td>"10"</td>
</tr>
</table>
<h3 id="condcondition-trueval-falseval">cond(condition, trueVal, [falseVal])</h3>
<p>Implements if-then-else logic, or if-then if falseVal is omitted.</p>
<table class="optionsTable">
<tr>
<th>Example</th>
<th>Result (assuming LINE = 5)</th>
</tr>
<tr>
<td><code>cond(LINE<=5 or LINE>=9, "edge", "center")</code></td>
<td>"edge"</td>
</tr>
<tr>
<td><code>cond(LINE<3, "Modify this line")</code></td>
<td>(Original text remains unchanged)</td>
</tr>
<tr>
<td><code>cond(LINE<10, cond(LINE<5, cond(LINE>2, "3-4", "0-2"), "5-9") , "10+")</code></td>
<td>"5-9" (Nested condition)</td>
</tr>
</table>
<h3>init({Variable1=Value1, Variable2=Value2, ...})</h3>
Initializes custom variables for use in various commands, extending beyond standard variables like CNT, MATCH, CAP1. These variables can carry the status of previous find-and-replace operations to subsequent ones.<p>
<p>
Custom variables maintain their values throughout a single Replace-All or within the list of multiple Replace operations. So they can transfer values from one list entry to the following ones. They reset at the start of each new document in 'Replace All in All Open Documents'.
</p>
<table class="optionsTable">
<tr>
<th>Find:</th>
<th>Replace:</th>
<th>Before</th>
<th>After</th>
</tr>
<tr>
<td><code>(\d+)</code></td>
<td><code>init({COL2=0,COL4=0}); cond(LCNT==4, COL2+COL4); if COL==2 then COL2=CAP1 end; if COL==4 then COL4=CAP1 end;</code></td>
<td>1,20,text,2,0<br>2,30,text,3,0<br>3,40,text,4,0</td>
<td>1,20,text,2,22.0<br>2,30,text,3,33.0<br>3,40,text,4,44.0</td>
</tr>
<tr>
<td><code>\d{2}-[A-Z]</code></td>
<td><code>init({MATCH_PREV=''}); cond(LCNT==1,'Moved', MATCH_PREV); MATCH_PREV=MATCH;</code></td>
<td>12-P,00-A<br>65-S,00-A<br>43-V,00-A</td>
<td>Moved,12-P<br>Moved,65-S<br>Moved,43-V</td>
</tr>
</table>
<h3>fmtN(num, maxDecimals, fixedDecimals)</h3>
<p>Formats numbers based on precision (maxDecimals) and whether the number of decimals is fixed (fixedDecimals being true or false).</p>
<p><strong>Note</strong>: The <code>fmtN</code> command can exclusively be used within the <code>set</code> and <code>cond</code> commands.</p>
<table class="optionsTable">
<tr>
<th>Example</th>
<th>Result</th>
</tr>
<tr>
<td><code>set(fmtN(5.73652, 2, true))</code></td>
<td>"5.74"</td>
</tr>
<tr>
<td><code>set(fmtN(5.0, 2, true))</code></td>
<td>"5.00"</td>
</tr>
<tr>
<td><code>set(fmtN(5.73652, 4, false))</code></td>
<td>"5.7365"</td>
</tr>
<tr>
<td><code>set(fmtN(5.0, 4, false))</code></td>
<td>"5"</td>
</tr>
</table>
</section>
<section id=Operators>
<h2>Operators</h2>
<table class="optionsTable">
<tr>
<th>Type</th>
<th>Operators</th>
<th>Example</th>
</tr>
<tr>
<td>Concatenation</td>
<td><code>..</code></td>
<td><code>set("Found "..CNT)</code></td>
</tr>
<tr>
<td>Arithmetic</td>
<td><code>+</code>, <code>-</code>, <code>*</code>, <code>/</code>, <code>^</code>, <code>%</code></td>
<td><code>set(CNT * 2)</code></td>
</tr>
<tr>
<td>Relational</td>
<td><code>==</code>, <code>~=</code>, <code><</code>, <code>></code>, <code><=</code>, <code>>=</code></td>
<td><code>cond(LINE == 1, "First", "Not first")</code></td>
</tr>
<tr>
<td>Logical</td>
<td><code>and</code>, <code>or</code>, <code>not</code></td>
<td><code>cond(LINE > 5 and CNT < 10, "Midrange", "Other")</code></td>
</tr>
</table>
</section>
<section id=IfThenLogic>
<h2>If-Then Logic</h2>
<p>
If-then logic is integral for dynamic replacements, allowing users to set custom variables based on specific conditions. This enhances the versatility of find-and-replace operations.
</p>
<p>
<strong>Note</strong>: Do not embed <code>cond()</code>, <code>set()</code>, or <code>init()</code> within <code>if</code> statements; <code>if</code> statements are exclusively for adjusting custom variables.
</p>
<h3>Syntax Combinations</h3>
<ul>
<li><code>if condition then ... end</code></li>
<li><code>if condition then ... else ... end</code></li>
<li><code>if condition then ... elseif another_condition then ... end</code></li>
<li><code>if condition then ... elseif another_condition then ... else ... end</code></li>
</ul>
<h3>Example</h3>
<p>
This example shows how to use <code>if</code> statements with <code>cond()</code> to manage variables based on conditions:
</p>
<code>init({MVAR=""}); if CAP2~=nil then MVAR=MVAR..CAP2 end; cond(string.sub(CAP1,1,1)~="#", MVAR); if CAP2~=nil then MVAR=string.sub(CAP1,4,-1) end</code>
</section>
<section id=DebugOption>
<h2>DEBUG option</h2>
<p>
The <code>DEBUG</code> option lets you inspect global variables during replacements. When enabled, it opens a message box displaying the current values of all global variables for each replacement hit, requiring confirmation to proceed to the next match. Initialize the <code>DEBUG</code> option in your replacement string to enable it.
</p>
<h3>Example</h3>
<table class="optionsTable">
<tr>
<th>Find:</th>
<th>Replace with:</th>
</tr>
<tr>
<td><code>(\d+)</code></td>
<td><code>init({DEBUG=true}); set("Number: "..CAP1)</code></td>
</tr>
</table>
</section>
<section id=FurtherFunctions>
<h2>Math & String Functions</h2>
<p>MultiReplace uses the <a href="https://www.lua.org/" target="_blank">Lua engine</a>, allowing for Lua math operations and string methods. Refer to <a href="https://www.lua.org/manual/5.4/manual.html#6.4" target="_blank">Lua String Manipulation</a> and <a href="https://www.lua.org/manual/5.4/manual.html#6.6" target="_blank">Lua Mathematical Functions</a> for more information.</p>
</section>
<section id=Examples>
<h2>Examples</h2>
<table class="optionsTable">
<tr>
<th>Find in:</th>
<th>Replace with:</th>
<th>Description/Expected Output</th>
<th>Regex</th>
<th>Scope CSV</th>
</tr>
<tr>
<td><code>;</code></td>
<td><code>cond(LCNT==5,";Column5;")</code></td>
<td>Adds a 5th Column for each line into a `;` delimited file.</td>
<td>No</td>
<td>No</td>
</tr>
<tr>
<td><code>key</code></td>
<td><code>set("key"..CNT)</code></td>
<td>Enumerates key values by appending the count of detected strings. E.g., key1, key2, key3, etc.</td>
<td>No</td>
<td>No</td>
</tr>
<tr>
<td><code>(\d+)</code></td>
<td><code>set(CAP1.."€ The VAT is: ".. (CAP1 * 0.15).."€ Total with VAT: ".. (CAP1 + (CAP1 * 0.15)).."€")</code></td>
<td>Finds a number and calculates the VAT at 15%, then displays the original amount, the VAT, and the total amount. E.g., `50` becomes `50€ The VAT is: 7.5€ Total with VAT: 57.5€`</td>
<td>Yes</td>
<td>No</td>
</tr>
<tr>
<td><code>---</code></td>
<td><code>cond(COL==1 and LINE<3, "0-2" , cond(COL==2 and LINE>2 and LINE<5, "3-4" , cond(COL==3 and LINE>=5 and LINE<10, "5-9" , cond(COL==4 and LINE>=10, "10+"))))</code></td>
<td>Replaces `---` with a specific range based on the `COL` and `LINE` values. E.g., `3-4` in column 2 of lines 3-4, and `5-9` in column 3 of lines 5-9 assuming `---` is found in all lines and columns.</td>
<td>No</td>
<td>Yes</td>
</tr>
<tr>
<td><code>(\d+)\.(\d+)\.(\d+)</code></td>
<td><code>cond(CAP1 > 0 and CAP2 == 0 and CAP3 == 0, MATCH, cond(CAP2 > 0 and CAP3 == 0, " " .. MATCH, " " .. MATCH))</code></td>
<td>Alters the spacing based on the hierarchy of the version numbers, aligning lower hierarchies with spaces as needed. E.g., `1.0.0` remains `1.0.0`, `1.2.0` becomes ` 1.2.0`, indicating a second-level version change.</td>
<td>Yes</td>
<td>No</td>
</tr>
<tr>
<td><code>(\d+)</code></td>
<td><code>set(CAP1 * 2)</code></td>
<td>Doubles the matched number. E.g., `100` becomes `200`.</td>
<td>Yes</td>
<td>No</td>
</tr>
<tr>
<td><code>;</code></td>
<td><code>cond(LCNT == 1, string.rep(" ", 20- (LPOS))..";")</code></td>
<td>Inserts spaces before the semicolon to align it to the 20th character position if it's the first occurrence.</td>
<td>No</td>
<td>No</td>
</tr>
<tr>
<td><code>-</code></td>
<td><code>cond(LINE == math.floor(10.5 + 6.25 * math.sin((2 * math.pi * LPOS) / 50)), "*", " ")</code></td>
<td>Draws a sine wave across a canvas of '-' characters spanning at least 20 lines and 80 characters per line.</td>
<td>No</td>
<td>No</td>
</tr>
<tr>
<td><code>^(.*)$</code></td>
<td><code>init({MATCH_PREV=1}); cond(MATCH == MATCH_PREV, ''); MATCH_PREV=MATCH;</code></td>
<td>Removes duplicate lines, keeping the first occurrence of each line. Matches an entire line and uses MATCH_PREV to identify and remove consecutive duplicates.</td>
<td>Yes</td>
<td>No</td>
</tr>
</table>
</section>
</article>
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