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<meta property="og:description" content="Convenient wrapper around grep to match a pattern: a %like% b. It always returns a logical vector and is always case-insensitive. Also, pattern (b) can be as long as x (a) to compare items of each index in both vectors." />
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<div class="page-header">
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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>
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<div class="ref-description">
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<p>Convenient wrapper around <code><a href='https://www.rdocumentation.org/packages/base/topics/grep'>grep</a></code> to match a pattern: <code>a %like% b</code>. It always returns a <code>logical</code> vector and is always case-insensitive. Also, <code>pattern</code> (<code>b</code>) can be as long as <code>x</code> (<code>a</code>) to compare items of each index in both vectors.</p>
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</div>
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<pre class="usage"><span class='fu'>like</span>(<span class='no'>x</span>, <span class='no'>pattern</span>)
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<span class='no'>x</span> <span class='kw'>%like%</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
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object which can be coerced by <code>as.character</code> to a character
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vector. <a href='https://www.rdocumentation.org/packages/base/topics/LongVectors'>Long vectors</a> are supported.</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>character string containing a <a href='https://www.rdocumentation.org/packages/base/topics/regex'>regular expression</a>
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(or character string for <code>fixed = TRUE</code>) to be matched
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in the given character vector. Coerced by
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<code><a href='https://www.rdocumentation.org/packages/base/topics/character'>as.character</a></code> to a character string if possible. If a
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character vector of length 2 or more is supplied, the first element
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is used with a warning. Missing values are allowed except for
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<code>regexpr</code> and <code>gregexpr</code>.</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.</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>logical</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 Ctrl+Shift+L or Cmd+Shift+L (see Tools > Modify Keyboard Shortcuts...).</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://www.rdocumentation.org/packages/base/topics/grep'>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"><div class='input'><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></div><div class='output co'>#> [1] TRUE</div><div class='input'><span class='co'>#> TRUE</span>
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<span class='no'>b</span> <span class='kw'>%like%</span> <span class='no'>a</span></div><div class='output co'>#> [1] FALSE</div><div class='input'><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://www.rdocumentation.org/packages/base/topics/c'>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://www.rdocumentation.org/packages/base/topics/c'>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></div><div class='output co'>#> [1] TRUE TRUE TRUE</div><div class='input'><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://www.rdocumentation.org/packages/base/topics/library'>library</a></span>(<span class='no'>dplyr</span>)
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<span class='no'>septic_patients</span> <span class='kw'>%>%</span>
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<span class='fu'><a href='join.html'>left_join_microorganisms</a></span>() <span class='kw'>%>%</span>
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<span class='fu'><a href='http://dplyr.tidyverse.org/reference/filter.html'>filter</a></span>(<span class='no'>genus</span> <span class='kw'>%like%</span> <span class='st'>'^ent'</span>) <span class='kw'>%>%</span>
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<span class='fu'><a href='freq.html'>freq</a></span>(<span class='no'>genus</span>, <span class='no'>species</span>)</div><div class='output co'>#> <span class='message'>Joining, by = "mo"</span></div><div class='output co'>#>
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#>
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#> **Frequency table of `genus` and `species`**
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#>
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#>
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#> | |Item | Count| Percent| Cum. Count| Cum. Percent|
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#> |:--|:--------------------------|-----:|-------:|----------:|------------:|
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#> |1 |Enterococcus faecalis | 39| 35.8%| 39| 35.8%|
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#> |2 |Enterobacter cloacae | 23| 21.1%| 62| 56.9%|
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#> |3 |Enterococcus faecium | 21| 19.3%| 83| 76.1%|
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#> |4 |Enterococcus species | 20| 18.3%| 103| 94.5%|
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#> |5 |Enterobacter aerogenes | 3| 2.8%| 106| 97.2%|
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#> |6 |Enterococcus avium | 2| 1.8%| 108| 99.1%|
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#> |7 |Enterococcus casseliflavus | 1| 0.9%| 109| 100.0%|
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#>
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#> </div></pre>
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</div>
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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="#see-also">See also</a></li>
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<li><a href="#examples">Examples</a></li>
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<p>Developed by Matthijs S. Berends, Christian F. Luz.</p>
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