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<!DOCTYPE html>
<!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Replace first or last line in strings — str_line_replace • FarmDynR</title><!-- jquery --><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script><!-- Bootstrap --><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha256-bZLfwXAP04zRMK2BjiO8iu9pf4FbLqX6zitd+tIvLhE=" crossorigin="anonymous"><script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha256-nuL8/2cJ5NDSSwnKD8VqreErSWHtnEP9E7AySL+1ev4=" crossorigin="anonymous"></script><!-- bootstrap-toc --><link rel="stylesheet" href="../bootstrap-toc.css"><script src="../bootstrap-toc.js"></script><!-- Font Awesome icons --><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/all.min.css" integrity="sha256-mmgLkCYLUQbXn0B1SRqzHar6dCnv9oZFPEC1g1cwlkk=" crossorigin="anonymous"><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/v4-shims.min.css" integrity="sha256-wZjR52fzng1pJHwx4aV2AO3yyTOXrcDW7jBpJtTwVxw=" crossorigin="anonymous"><!-- clipboard.js --><script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.6/clipboard.min.js" integrity="sha256-inc5kl9MA1hkeYUt+EC3BhlIgyp/2jDIyBLS6k3UxPI=" crossorigin="anonymous"></script><!-- headroom.js --><script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/headroom.min.js" integrity="sha256-AsUX4SJE1+yuDu5+mAVzJbuYNPHj/WroHuZ8Ir/CkE0=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/jQuery.headroom.min.js" integrity="sha256-ZX/yNShbjqsohH1k95liqY9Gd8uOiE1S4vZc+9KQ1K4=" crossorigin="anonymous"></script><!-- pkgdown --><link href="../pkgdown.css" rel="stylesheet"><script src="../pkgdown.js"></script><meta property="og:title" content="Replace first or last line in strings — str_line_replace"><meta property="og:description" content="These functions serve to change the first or last line of strings which match a specific pattern (regex).
`str_firstLine_replace()` replaces the first line that matches the pattern.
`str_lastLine_replace()` replaces the last line that matches the pattern
They are useful, for example, when reading a text file with many lines and you want to preserve the lines of that text file.
When `which='all'`, it is a wrapper for `stringr::str_replace()`.
These functions serve to change the first or last line of strings which match a specific pattern (regex).
`str_firstLine_replace()` replaces the first line that matches the pattern.
`str_lastLine_replace()` replaces the last line that matches the pattern
They are useful, for example, when reading a text file with many lines and you want to preserve the lines of that text file.
When `which='all'`, it is a wrapper for `stringr::str_replace()`."><!-- mathjax --><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js" integrity="sha256-nvJJv9wWKEm88qvoQl9ekL2J+k/RWIsaSScxxlsrv8k=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-84DKXVJXs0/F8OTMzX4UR909+jtl4G7SPypPavF+GfA=" crossorigin="anonymous"></script><!--[if lt IE 9]>
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<h1>Replace first or last line in strings</h1>
<div class="hidden name"><code>str_line_replace.Rd</code></div>
</div>
<div class="ref-description">
<p>These functions serve to change the first or last line of strings which match a specific pattern (regex).
`str_firstLine_replace()` replaces the first line that matches the pattern.
`str_lastLine_replace()` replaces the last line that matches the pattern
They are useful, for example, when reading a text file with many lines and you want to preserve the lines of that text file.
When `which='all'`, it is a wrapper for `stringr::str_replace()`.</p>
<p>These functions serve to change the first or last line of strings which match a specific pattern (regex).
`str_firstLine_replace()` replaces the first line that matches the pattern.
`str_lastLine_replace()` replaces the last line that matches the pattern
They are useful, for example, when reading a text file with many lines and you want to preserve the lines of that text file.
When `which='all'`, it is a wrapper for `stringr::str_replace()`.</p>
</div>
<div id="ref-usage">
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">str_line_replace</span><span class="op">(</span></span>
<span> <span class="va">str</span>,</span>
<span> <span class="va">pattern</span>,</span>
<span> <span class="va">replacement</span>,</span>
<span> which <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">"first"</span>, <span class="st">"last"</span>, <span class="st">"poles"</span>, <span class="st">"all"</span><span class="op">)</span></span>
<span><span class="op">)</span></span>
<span></span>
<span><span class="fu">str_firstLine_replace</span><span class="op">(</span><span class="va">str</span>, <span class="va">pattern</span>, <span class="va">replacement</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">str_lastLine_replace</span><span class="op">(</span><span class="va">str</span>, <span class="va">pattern</span>, <span class="va">replacement</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">str_line_replace</span><span class="op">(</span></span>
<span> <span class="va">str</span>,</span>
<span> <span class="va">pattern</span>,</span>
<span> <span class="va">replacement</span>,</span>
<span> which <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">"first"</span>, <span class="st">"last"</span>, <span class="st">"poles"</span>, <span class="st">"all"</span><span class="op">)</span></span>
<span><span class="op">)</span></span>
<span></span>
<span><span class="fu">str_firstLine_replace</span><span class="op">(</span><span class="va">str</span>, <span class="va">pattern</span>, <span class="va">replacement</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">str_lastLine_replace</span><span class="op">(</span><span class="va">str</span>, <span class="va">pattern</span>, <span class="va">replacement</span><span class="op">)</span></span></code></pre></div>
</div>
<div id="arguments">
<h2>Arguments</h2>
<dl><dt>str</dt>
<dd><p>String with pattern to make replacement</p></dd>
<dt>pattern</dt>
<dd><p>Regular expression to replace</p></dd>
<dt>replacement</dt>
<dd><p>What to replace the pattern with</p></dd>
<dt>which</dt>
<dd><p>which one? first, last, all or the poles (first AND last)</p></dd>
</dl></div>
<div id="value">
<h2>Value</h2>
<p>string</p>
<p>string</p>
</div>
<div id="see-also">
<h2>See also</h2>
<div class="dont-index"><p>[stringr::str_replace()]</p>
<p>[stringr::str_replace()]</p></div>
</div>
<div id="ref-examples">
<h2>Examples</h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">somelines</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">'AAAAA'</span>, <span class="st">'textytext'</span>, <span class="st">'BBBBB'</span>, <span class="st">'AAAAA'</span>, <span class="st">'writingwriting'</span>, <span class="st">'AAAAA'</span>, <span class="st">'etc'</span>, <span class="st">'etc'</span>, <span class="st">'BBBBB'</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_firstLine_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedfirstline'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "changedfirstline" "textytext" "BBBBB" "AAAAA" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "AAAAA" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_lastLine_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedlastline'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "AAAAA" "textytext" "BBBBB" "AAAAA" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "changedlastline" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_line_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedpoles'</span>, which<span class="op">=</span><span class="st">'poles'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "changedpoles" "textytext" "BBBBB" "AAAAA" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "changedpoles" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_line_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedall'</span>, which<span class="op">=</span><span class="st">'all'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "changedall" "textytext" "BBBBB" "changedall" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "changedall" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">somelines</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">'AAAAA'</span>, <span class="st">'textytext'</span>, <span class="st">'BBBBB'</span>, <span class="st">'AAAAA'</span>, <span class="st">'writingwriting'</span>, <span class="st">'AAAAA'</span>, <span class="st">'etc'</span>, <span class="st">'etc'</span>, <span class="st">'BBBBB'</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_firstLine_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedfirstline'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "changedfirstline" "textytext" "BBBBB" "AAAAA" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "AAAAA" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_lastLine_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedlastline'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "AAAAA" "textytext" "BBBBB" "AAAAA" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "changedlastline" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_line_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedpoles'</span>, which<span class="op">=</span><span class="st">'poles'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "changedpoles" "textytext" "BBBBB" "AAAAA" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "changedpoles" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">str_line_replace</span><span class="op">(</span><span class="va">somelines</span>, <span class="st">'AAAAA'</span>, <span class="st">'changedall'</span>, which<span class="op">=</span><span class="st">'all'</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "changedall" "textytext" "BBBBB" "changedall" </span>
<span class="r-out co"><span class="r-pr">#></span> [5] "writingwriting" "changedall" "etc" "etc" </span>
<span class="r-out co"><span class="r-pr">#></span> [9] "BBBBB" </span>
<span class="r-in"><span></span></span>
</code></pre></div>
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