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<img src="../logo.svg" class="logo" alt=""><h1>Vectorised Pattern Matching with Keyboard Shortcut</h1>
<small class="dont-index">Source: <a href="https://github.com/msberends/AMR/blob/HEAD/R/like.R" class="external-link"><code>R/like.R</code></a></small>
<div class="d-none name"><code>like.Rd</code></div>
</div>
<div class="ref-description section level2">
<p>Convenient wrapper around <code><a href="https://rdrr.io/r/base/grep.html" class="external-link">grepl()</a></code> to match a pattern: <code>x %like% pattern</code>. It always returns a <code><a href="https://rdrr.io/r/base/logical.html" class="external-link">logical</a></code> vector and is always case-insensitive (use <code>x %like_case% pattern</code> for case-sensitive matching). Also, <code>pattern</code> can be as long as <code>x</code> to compare items of each index in both vectors, or they both can have the same length to iterate over all cases.</p>
</div>
<div class="section level2">
<h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">like</span><span class="op">(</span><span class="va">x</span>, <span class="va">pattern</span>, ignore.case <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span>
<span></span>
<span><span class="va">x</span> <span class="op">%like%</span> <span class="va">pattern</span></span>
<span></span>
<span><span class="va">x</span> <span class="op">%unlike%</span> <span class="va">pattern</span></span>
<span></span>
<span><span class="va">x</span> <span class="op">%like_case%</span> <span class="va">pattern</span></span>
<span></span>
<span><span class="va">x</span> <span class="op">%unlike_case%</span> <span class="va">pattern</span></span></code></pre></div>
</div>
<div class="section level2">
<h2 id="source">Source<a class="anchor" aria-label="anchor" href="#source"></a></h2>
<p>Idea from the <a href="https://github.com/Rdatatable/data.table/blob/ec1259af1bf13fc0c96a1d3f9e84d55d8106a9a4/R/like.R" class="external-link"><code>like</code> function from the <code>data.table</code> package</a>, although altered as explained in <em>Details</em>.</p>
</div>
<div class="section level2">
<h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>
<dl><dt>x</dt>
<dd><p>a <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> vector where matches are sought, or an object which can be coerced by <code><a href="https://rdrr.io/r/base/character.html" class="external-link">as.character()</a></code> to a <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> vector.</p></dd>
<dt>pattern</dt>
<dd><p>a <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> vector containing regular expressions (or a <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> string for <code>fixed = TRUE</code>) to be matched in the given <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> vector. Coerced by <code><a href="https://rdrr.io/r/base/character.html" class="external-link">as.character()</a></code> to a <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> string if possible.</p></dd>
<dt>ignore.case</dt>
<dd><p>if <code>FALSE</code>, the pattern matching is <em>case sensitive</em> and if <code>TRUE</code>, case is ignored during matching.</p></dd>
</dl></div>
<div class="section level2">
<h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
<p>A <a href="https://rdrr.io/r/base/logical.html" class="external-link">logical</a> vector</p>
</div>
<div class="section level2">
<h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
<p>These <code>like()</code> and <code>%like%</code>/<code>%unlike%</code> functions:</p><ul><li><p>Are case-insensitive (use <code>%like_case%</code>/<code>%unlike_case%</code> for case-sensitive matching)</p></li>
<li><p>Support multiple patterns</p></li>
<li><p>Check if <code>pattern</code> is a valid regular expression and sets <code>fixed = TRUE</code> if not, to greatly improve speed (vectorised over <code>pattern</code>)</p></li>
<li><p>Always use compatibility with Perl unless <code>fixed = TRUE</code>, to greatly improve speed</p></li>
</ul><p>Using RStudio? The <code>%like%</code>/<code>%unlike%</code> functions can also be directly inserted in your code from the Addins menu and can have its own keyboard shortcut like <code>Shift+Ctrl+L</code> or <code>Shift+Cmd+L</code> (see menu <code>Tools</code> &gt; <code>Modify Keyboard Shortcuts...</code>). If you keep pressing your shortcut, the inserted text will be iterated over <code>%like%</code> -&gt; <code>%unlike%</code> -&gt; <code>%like_case%</code> -&gt; <code>%unlike_case%</code>.</p>
</div>
<div class="section level2">
<h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2>
<div class="dont-index"><p><code><a href="https://rdrr.io/r/base/grep.html" class="external-link">grepl()</a></code></p></div>
</div>
<div class="section level2">
<h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="va">a</span> <span class="op">&lt;-</span> <span class="st">"This is a test"</span></span></span>
<span class="r-in"><span><span class="va">b</span> <span class="op">&lt;-</span> <span class="st">"TEST"</span></span></span>
<span class="r-in"><span><span class="va">a</span> <span class="op">%like%</span> <span class="va">b</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] TRUE</span>
<span class="r-in"><span><span class="va">b</span> <span class="op">%like%</span> <span class="va">a</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] FALSE</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># also supports multiple patterns</span></span></span>
<span class="r-in"><span><span class="va">a</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"Test case"</span>, <span class="st">"Something different"</span>, <span class="st">"Yet another thing"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">b</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"case"</span>, <span class="st">"diff"</span>, <span class="st">"yet"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">a</span> <span class="op">%like%</span> <span class="va">b</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] TRUE TRUE TRUE</span>
<span class="r-in"><span><span class="va">a</span> <span class="op">%unlike%</span> <span class="va">b</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] FALSE FALSE FALSE</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">a</span><span class="op">[</span><span class="fl">1</span><span class="op">]</span> <span class="op">%like%</span> <span class="va">b</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] TRUE FALSE FALSE</span>
<span class="r-in"><span><span class="va">a</span> <span class="op">%like%</span> <span class="va">b</span><span class="op">[</span><span class="fl">1</span><span class="op">]</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] TRUE FALSE FALSE</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># \donttest{</span></span></span>
<span class="r-in"><span><span class="co"># get isolates whose name start with 'Entero' (case-insensitive)</span></span></span>
<span class="r-in"><span><span class="va">example_isolates</span><span class="op">[</span><span class="fu"><a href="https://rdrr.io/r/base/which.html" class="external-link">which</a></span><span class="op">(</span><span class="fu"><a href="mo_property.html">mo_name</a></span><span class="op">(</span><span class="op">)</span> <span class="op">%like%</span> <span class="st">"^entero"</span><span class="op">)</span>, <span class="op">]</span></span></span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> Using column 'mo' as input for mo_name()</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># A tibble: 106 × 46</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> date patient age gender ward mo PEN OXA FLC AMX </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494; font-style: italic;">&lt;date&gt;</span> <span style="color: #949494; font-style: italic;">&lt;chr&gt;</span> <span style="color: #949494; font-style: italic;">&lt;dbl&gt;</span> <span style="color: #949494; font-style: italic;">&lt;chr&gt;</span> <span style="color: #949494; font-style: italic;">&lt;chr&gt;</span> <span style="color: #949494; font-style: italic;">&lt;mo&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 1</span> 2002-02-21 4FC193 69 M Clinic… B_ENTRC_FACM NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 2</span> 2002-04-08 130252 78 M ICU B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 3</span> 2002-06-23 798871 82 M Clinic… B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 4</span> 2002-06-23 798871 82 M Clinic… B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 5</span> 2003-04-20 6BC362 62 M ICU B_ENTRC NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 6</span> 2003-04-21 6BC362 62 M ICU B_ENTRC NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 7</span> 2003-08-13 F35553 52 M ICU B_ENTRBC_CLOC R NA NA R </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 8</span> 2003-08-13 F35553 52 M ICU B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 9</span> 2003-09-05 F35553 52 M ICU B_ENTRC NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;">10</span> 2003-09-05 F35553 52 M ICU B_ENTRBC_CLOC R NA NA R </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># … with 96 more rows, and 36 more variables: AMC &lt;sir&gt;, AMP &lt;sir&gt;, TZP &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># CZO &lt;sir&gt;, FEP &lt;sir&gt;, CXM &lt;sir&gt;, FOX &lt;sir&gt;, CTX &lt;sir&gt;, CAZ &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># CRO &lt;sir&gt;, GEN &lt;sir&gt;, TOB &lt;sir&gt;, AMK &lt;sir&gt;, KAN &lt;sir&gt;, TMP &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># SXT &lt;sir&gt;, NIT &lt;sir&gt;, FOS &lt;sir&gt;, LNZ &lt;sir&gt;, CIP &lt;sir&gt;, MFX &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># VAN &lt;sir&gt;, TEC &lt;sir&gt;, TCY &lt;sir&gt;, TGC &lt;sir&gt;, DOX &lt;sir&gt;, ERY &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># CLI &lt;sir&gt;, AZM &lt;sir&gt;, IPM &lt;sir&gt;, MEM &lt;sir&gt;, MTR &lt;sir&gt;, CHL &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># COL &lt;sir&gt;, MUP &lt;sir&gt;, RIF &lt;sir&gt;</span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="kw">if</span> <span class="op">(</span><span class="kw"><a href="https://rdrr.io/r/base/library.html" class="external-link">require</a></span><span class="op">(</span><span class="st"><a href="https://dplyr.tidyverse.org" class="external-link">"dplyr"</a></span><span class="op">)</span><span class="op">)</span> <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="va">example_isolates</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html" class="external-link">%&gt;%</a></span></span></span>
<span class="r-in"><span> <span class="fu"><a href="https://dplyr.tidyverse.org/reference/filter.html" class="external-link">filter</a></span><span class="op">(</span><span class="fu"><a href="mo_property.html">mo_name</a></span><span class="op">(</span><span class="op">)</span> <span class="op">%like%</span> <span class="st">"^ent"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">}</span></span></span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> Using column 'mo' as input for mo_name()</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># A tibble: 106 × 46</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> date patient age gender ward mo PEN OXA FLC AMX </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494; font-style: italic;">&lt;date&gt;</span> <span style="color: #949494; font-style: italic;">&lt;chr&gt;</span> <span style="color: #949494; font-style: italic;">&lt;dbl&gt;</span> <span style="color: #949494; font-style: italic;">&lt;chr&gt;</span> <span style="color: #949494; font-style: italic;">&lt;chr&gt;</span> <span style="color: #949494; font-style: italic;">&lt;mo&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span> <span style="color: #949494; font-style: italic;">&lt;sir&gt;</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 1</span> 2002-02-21 4FC193 69 M Clinic… B_ENTRC_FACM NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 2</span> 2002-04-08 130252 78 M ICU B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 3</span> 2002-06-23 798871 82 M Clinic… B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 4</span> 2002-06-23 798871 82 M Clinic… B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 5</span> 2003-04-20 6BC362 62 M ICU B_ENTRC NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 6</span> 2003-04-21 6BC362 62 M ICU B_ENTRC NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 7</span> 2003-08-13 F35553 52 M ICU B_ENTRBC_CLOC R NA NA R </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 8</span> 2003-08-13 F35553 52 M ICU B_ENTRC_FCLS NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;"> 9</span> 2003-09-05 F35553 52 M ICU B_ENTRC NA NA NA NA </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #BCBCBC;">10</span> 2003-09-05 F35553 52 M ICU B_ENTRBC_CLOC R NA NA R </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># … with 96 more rows, and 36 more variables: AMC &lt;sir&gt;, AMP &lt;sir&gt;, TZP &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># CZO &lt;sir&gt;, FEP &lt;sir&gt;, CXM &lt;sir&gt;, FOX &lt;sir&gt;, CTX &lt;sir&gt;, CAZ &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># CRO &lt;sir&gt;, GEN &lt;sir&gt;, TOB &lt;sir&gt;, AMK &lt;sir&gt;, KAN &lt;sir&gt;, TMP &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># SXT &lt;sir&gt;, NIT &lt;sir&gt;, FOS &lt;sir&gt;, LNZ &lt;sir&gt;, CIP &lt;sir&gt;, MFX &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># VAN &lt;sir&gt;, TEC &lt;sir&gt;, TCY &lt;sir&gt;, TGC &lt;sir&gt;, DOX &lt;sir&gt;, ERY &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># CLI &lt;sir&gt;, AZM &lt;sir&gt;, IPM &lt;sir&gt;, MEM &lt;sir&gt;, MTR &lt;sir&gt;, CHL &lt;sir&gt;,</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <span style="color: #949494;"># COL &lt;sir&gt;, MUP &lt;sir&gt;, RIF &lt;sir&gt;</span></span>
<span class="r-in"><span><span class="co"># }</span></span></span>
</code></pre></div>
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