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<h1>Pattern Matching</h1>
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<div class="hidden name"><code>like.Rd</code></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'>base::grep()</a></code> to match a pattern: <code>a %like% b</code>. It always returns a <code><a href='https://rdrr.io/r/base/logical.html'>logical</a></code> vector and is always case-insensitive (use <code>a %like_case% b</code> for case-sensitive matching). Also, <code>pattern</code> (<em>b</em>) can be as long as <code>x</code> (<em>a</em>) to compare items of each index in both vectors, or can both have the same length to iterate over all cases.</p>
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<pre class="usage"><span class='fu'>like</span>(<span class='no'>x</span>, <span class='no'>pattern</span>, <span class='kw'>ignore.case</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>)
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<span class='no'>x</span> <span class='kw'>%like%</span> <span class='no'>pattern</span>
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<span class='no'>x</span> <span class='kw'>%like_case%</span> <span class='no'>pattern</span></pre>
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<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
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<table class="ref-arguments">
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<colgroup><col class="name" /><col class="desc" /></colgroup>
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<tr>
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<th>x</th>
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<td><p>a character vector where matches are sought, or an object which can be coerced by <code><a href='https://rdrr.io/r/base/character.html'>as.character()</a></code> to a character vector.</p></td>
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</tr>
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<tr>
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<th>pattern</th>
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<td><p>a character string containing a regular expression (or <code><a href='https://rdrr.io/r/base/character.html'>character</a></code> string for <code>fixed = TRUE</code>) to be matched in the given character vector. Coerced by <code><a href='https://rdrr.io/r/base/character.html'>as.character()</a></code> to a character string if possible. If a <code><a href='https://rdrr.io/r/base/character.html'>character</a></code> vector of length 2 or more is supplied, the first element is used with a warning.</p></td>
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</tr>
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<tr>
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<th>ignore.case</th>
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<td><p>if <code>FALSE</code>, the pattern matching is <em>case sensitive</em> and if <code>TRUE</code>, case is ignored during matching.</p></td>
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</tr>
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</table>
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<h2 class="hasAnchor" id="source"><a class="anchor" href="#source"></a>Source</h2>
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<p>Idea from the <a href='https://github.com/Rdatatable/data.table/blob/master/R/like.R'><code>like</code> function from the <code>data.table</code> package</a>, but made it case insensitive at default and let it support multiple patterns. Also, if the regex fails the first time, it tries again with <code>perl = TRUE</code>.</p>
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<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
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<p>A <code><a href='https://rdrr.io/r/base/logical.html'>logical</a></code> vector</p>
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<h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>
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<p>Using RStudio? This function can also be inserted from the Addins menu and can have its own Keyboard Shortcut like <code>Ctrl+Shift+L</code> or <code>Cmd+Shift+L</code> (see <code>Tools</code> > <code>Modify Keyboard Shortcuts...</code>).</p>
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<h2 class="hasAnchor" id="read-more-on-our-website-"><a class="anchor" href="#read-more-on-our-website-"></a>Read more on our website!</h2>
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<p>On our website <a href='https://msberends.gitlab.io/AMR'>https://msberends.gitlab.io/AMR</a> you can find <a href='https://msberends.gitlab.io/AMR/articles/AMR.html'>a tutorial</a> about how to conduct AMR analysis, the <a href='https://msberends.gitlab.io/AMR/reference'>complete documentation of all functions</a> (which reads a lot easier than here in R) and <a href='https://msberends.gitlab.io/AMR/articles/WHONET.html'>an example analysis using WHONET data</a>.</p>
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<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
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<div class='dont-index'><p><code><a href='https://rdrr.io/r/base/grep.html'>base::grep()</a></code></p></div>
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<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
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<pre class="examples"><span class='co'># simple test</span>
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<span class='no'>a</span> <span class='kw'><-</span> <span class='st'>"This is a test"</span>
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<span class='no'>b</span> <span class='kw'><-</span> <span class='st'>"TEST"</span>
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<span class='no'>a</span> <span class='kw'>%like%</span> <span class='no'>b</span>
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<span class='co'>#> TRUE</span>
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<span class='no'>b</span> <span class='kw'>%like%</span> <span class='no'>a</span>
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<span class='co'>#> FALSE</span>
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<span class='co'># also supports multiple patterns, length must be equal to x</span>
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<span class='no'>a</span> <span class='kw'><-</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"Test case"</span>, <span class='st'>"Something different"</span>, <span class='st'>"Yet another thing"</span>)
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<span class='no'>b</span> <span class='kw'><-</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"case"</span>, <span class='st'>"diff"</span>, <span class='st'>"yet"</span>)
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<span class='no'>a</span> <span class='kw'>%like%</span> <span class='no'>b</span>
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<span class='co'>#> TRUE TRUE TRUE</span>
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<span class='co'># get frequencies of bacteria whose name start with 'Ent' or 'ent'</span>
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<span class='fu'><a href='https://rdrr.io/r/base/library.html'>library</a></span>(<span class='no'>dplyr</span>)
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<span class='no'>example_isolates</span> <span class='kw'>%>%</span>
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<span class='fu'><a href='https://dplyr.tidyverse.org/reference/filter.html'>filter</a></span>(<span class='fu'><a href='mo_property.html'>mo_genus</a></span>(<span class='no'>mo</span>) <span class='kw'>%like%</span> <span class='st'>'^ent'</span>) <span class='kw'>%>%</span>
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<span class='fu'><a href='https://rdrr.io/pkg/cleaner/man/freq.html'>freq</a></span>(<span class='fu'><a href='mo_property.html'>mo_fullname</a></span>(<span class='no'>mo</span>))</pre>
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<h2>Contents</h2>
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<ul class="nav nav-pills nav-stacked">
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<li><a href="#arguments">Arguments</a></li>
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<li><a href="#source">Source</a></li>
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<li><a href="#value">Value</a></li>
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<li><a href="#details">Details</a></li>
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<li><a href="#read-more-on-our-website-">Read more on our website!</a></li>
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<li><a href="#see-also">See also</a></li>
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<li><a href="#examples">Examples</a></li>
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<p>Developed by <a href='https://www.rug.nl/staff/m.s.berends/'>Matthijs S. Berends</a>, <a href='https://www.rug.nl/staff/c.f.luz/'>Christian F. Luz</a>, <a href='https://www.rug.nl/staff/a.w.friedrich/'>Alex W. Friedrich</a>, <a href='https://www.rug.nl/staff/b.sinha/'>Bhanu N. M. Sinha</a>, <a href='https://www.rug.nl/staff/c.j.albers/'>Casper J. Albers</a>, <a href='https://www.rug.nl/staff/c.glasner/'>Corinna Glasner</a>.</p>
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