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<h1>Pattern Matching</h1>
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<small class="dont-index">Source: <a href='https://github.com/msberends/AMR/blob/master/R/like.R'><code>R/like.R</code></a></small>
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<div class="hidden name"><code>like.Rd</code></div>
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<p>Convenient wrapper around <code><a href='https://rdrr.io/r/base/grep.html'>grep()</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'>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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<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></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>The <code>%like%</code> function:</p><ul>
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<li><p>Is case insensitive (use <code>%like_case%</code> for case-sensitive matching)</p></li>
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<li><p>Supports multiple patterns</p></li>
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<li><p>Checks if <code>pattern</code> is a regular expression and sets <code>fixed = TRUE</code> if not, to greatly improve speed</p></li>
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<li><p>Tries again with <code>perl = TRUE</code> if regex fails</p></li>
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</ul>
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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="stable-lifecycle"><a class="anchor" href="#stable-lifecycle"></a>Stable lifecycle</h2>
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<p><img src='figures/lifecycle_stable.svg' style=margin-bottom:5px /> <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, a parameter will be deprecated and first continue to work, but will emit an 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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<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.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 analysis, the <a href='https://msberends.github.io/AMR/reference'>complete documentation of all functions</a> (which reads a lot easier than here in R) and <a href='https://msberends.github.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 isolates whose name start with 'Ent' or 'ent'</span>
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<span class='kw'>if</span> (<span class='fl'>FALSE</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_name</a></span>(<span class='no'>mo</span>) <span class='kw'>%like%</span> <span class='st'>"^ent"</span>)
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}</pre>
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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/'>Alexander 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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