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+<title>Text.index_of — Ludic</title>
+<meta name="description" content="The byte index of a substring, or -1 if absent.">
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+  <div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-text.html">Text</a> <span>›</span> <span class="here">Text.index_of</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-method">method</span>
+    <h1 id="top">Text.index_of</h1>
+  </div>
+  <code class="sig">Text.index_of(s, sub) -&gt; int</code>
+  <div class="desc"><p>Returns the zero-based byte index where <code>sub</code> first appears in <code>s</code>, or <code>-1</code> if it never does — so <code>Text.index_of("hello world", "world")</code> is <code>6</code>. Use it to locate a separator before slicing, or as a present-and-where test in one call: guard with <code>if idx >= 0</code>. It reports the first match only.</p></div>
+  <div class="params"><h2>Parameters</h2><div class="param" id="param-s"><code class="pname">s</code><span class="pdesc">the string to search</span></div><div class="param" id="param-sub"><code class="pname">sub</code><span class="pdesc">the substring to locate</span></div></div>
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program KeyValue {
+  var pair: string = "hp=42"
+
+  handler Parse phase Update {
+    let eq = Text.index_of(pair, "=")            # 2
+    let key = Text.slice(pair, 0, eq)            # "hp"
+    let value = Text.to_int(Text.slice(pair, eq + 1, Text.length(pair)))
+  }
+}</pre></div>
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