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<h1>Vectorised Pattern Matching with Keyboard Shortcut</h1>
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<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>
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<div class="hidden name"><code>like.Rd</code></div>
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</div>
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<div class="ref-description">
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<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>
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</div>
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<div id="ref-usage">
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<div class="sourceCode"><pre class="sourceCode r"><code><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>
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<span class="va">x</span> <span class="op">%like%</span> <span class="va">pattern</span>
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<span class="va">x</span> <span class="op">%unlike%</span> <span class="va">pattern</span>
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<span class="va">x</span> <span class="op">%like_case%</span> <span class="va">pattern</span>
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<span class="va">x</span> <span class="op">%unlike_case%</span> <span class="va">pattern</span></code></pre></div>
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</div>
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<div id="source">
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<h2>Source</h2>
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<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>
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</div>
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<div id="arguments">
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<h2>Arguments</h2>
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<dl><dt>x</dt>
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<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>
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<dt>pattern</dt>
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<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>
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<dt>ignore.case</dt>
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<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>
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</dl></div>
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<div id="value">
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<h2>Value</h2>
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<p>A <a href="https://rdrr.io/r/base/logical.html" class="external-link">logical</a> vector</p>
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</div>
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<div id="details">
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<h2>Details</h2>
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<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>
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<li><p>Support multiple patterns</p></li>
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<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>
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<li><p>Always use compatibility with Perl unless <code>fixed = TRUE</code>, to greatly improve speed</p></li>
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</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> > <code>Modify Keyboard Shortcuts...</code>). If you keep pressing your shortcut, the inserted text will be iterated over <code>%like%</code> -> <code>%unlike%</code> -> <code>%like_case%</code> -> <code>%unlike_case%</code>.</p>
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</div>
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<div id="stable-lifecycle">
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<h2>Stable Lifecycle</h2>
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<p><img src="figures/lifecycle_stable.svg" style='margin-bottom:"5"'><br>
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The <a href="lifecycle.html">lifecycle</a> of this function is <strong>stable</strong>. In a stable function, major changes are unlikely. This means that the unlying code will generally evolve by adding new arguments; removing arguments or changing the meaning of existing arguments will be avoided.</p>
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<p>If the unlying code needs breaking changes, they will occur gradually. For example, an argument will be deprecated and first continue to work, but will emit a message informing you of the change. Next, typically after at least one newly released version on CRAN, the message will be transformed to an error.</p>
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</div>
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<div id="read-more-on-our-website-">
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<h2>Read more on Our Website!</h2>
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<p>On our website <a href="https://msberends.github.io/AMR/">https://msberends.github.io/AMR/</a> you can find <a href="https://msberends.github.io/AMR/articles/AMR.html">a comprehensive tutorial</a> about how to conduct AMR data analysis, the <a href="https://msberends.github.io/AMR/reference/">complete documentation of all functions</a> and <a href="https://msberends.github.io/AMR/articles/WHONET.html">an example analysis using WHONET data</a>.</p>
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</div>
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<div id="see-also">
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<h2>See also</h2>
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<div class="dont-index"><p><code><a href="https://rdrr.io/r/base/grep.html" class="external-link">grepl()</a></code></p></div>
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</div>
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<div id="ref-examples">
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<h2>Examples</h2>
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<div class="sourceCode"><pre class="sourceCode r"><code><span class="va">a</span> <span class="op"><-</span> <span class="st">"This is a test"</span>
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<span class="va">b</span> <span class="op"><-</span> <span class="st">"TEST"</span>
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<span class="va">a</span> <span class="op">%like%</span> <span class="va">b</span>
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<span class="co">#> TRUE</span>
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<span class="va">b</span> <span class="op">%like%</span> <span class="va">a</span>
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<span class="co">#> FALSE</span>
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<span class="co"># also supports multiple patterns</span>
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<span class="va">a</span> <span class="op"><-</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>
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<span class="va">b</span> <span class="op"><-</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>
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<span class="va">a</span> <span class="op">%like%</span> <span class="va">b</span>
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<span class="co">#> TRUE TRUE TRUE</span>
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<span class="va">a</span> <span class="op">%unlike%</span> <span class="va">b</span>
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<span class="co">#> FALSE FALSE FALSE</span>
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<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>
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<span class="co">#> TRUE FALSE FALSE</span>
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<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>
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<span class="co">#> TRUE FALSE FALSE</span>
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<span class="co"># get isolates whose name start with 'Ent' or 'ent'</span>
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<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="va">example_isolates</span><span class="op">$</span><span class="va">mo</span><span class="op">)</span> <span class="op">%like%</span> <span class="st">"^ent"</span><span class="op">)</span>, <span class="op">]</span>
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<span class="co"># \donttest{</span>
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<span class="co"># faster way, since mo_name() is context-aware:</span>
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<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">"^ent"</span><span class="op">)</span>, <span class="op">]</span>
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<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>
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<span class="va">example_isolates</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html" class="external-link">%>%</a></span>
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<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>
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<span class="op">}</span>
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<span class="co"># }</span>
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</code></pre></div>
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