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<section id="string-replace-replace-substrings">
<h1>string-replace - replace substrings<a class="headerlink" href="#string-replace-replace-substrings" title="Link to this heading">¶</a></h1>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Link to this heading">¶</a></h2>
<div class="highlight-fish-synopsis notranslate"><div class="highlight"><pre><span></span><span class="nf">string</span><span class="w"> </span><span class="no">replace</span><span class="w"> </span><span class="g g-Other">[</span><span class="no">-a</span><span class="w"> </span><span class="g g-Other">|</span><span class="w"> </span><span class="no">--all</span><span class="g g-Other">]</span><span class="w"> </span><span class="g g-Other">[</span><span class="no">-f</span><span class="w"> </span><span class="g g-Other">|</span><span class="w"> </span><span class="no">--filter</span><span class="g g-Other">]</span><span class="w"> </span><span class="g g-Other">[</span><span class="no">-i</span><span class="w"> </span><span class="g g-Other">|</span><span class="w"> </span><span class="no">--ignore-case</span><span class="g g-Other">]</span>
<span class="w"> </span><span class="g g-Other">[</span><span class="no">-r</span><span class="w"> </span><span class="g g-Other">|</span><span class="w"> </span><span class="no">--regex</span><span class="g g-Other">]</span><span class="w"> </span><span class="g g-Other">[(</span><span class="no">-m</span><span class="w"> </span><span class="g g-Other">|</span><span class="w"> </span><span class="no">--max-matches</span><span class="g g-Other">)</span><span class="w"> </span><span class="no">MAX</span><span class="g g-Other">]</span><span class="w"> </span><span class="g g-Other">[</span><span class="no">-q</span><span class="w"> </span><span class="g g-Other">|</span><span class="w"> </span><span class="no">--quiet</span><span class="g g-Other">]</span>
<span class="w"> </span><span class="no">PATTERN</span><span class="w"> </span><span class="no">REPLACEMENT</span><span class="w"> </span><span class="g g-Other">[</span><span class="no">STRING</span><span class="w"> </span><span class="g g-Other">...]</span>
</pre></div>
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</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">string</span> <span class="pre">replace</span></code> is similar to <code class="docutils literal notranslate"><span class="pre">string</span> <span class="pre">match</span></code> but replaces non-overlapping matching substrings with a replacement string and prints the result. By default, <em>PATTERN</em> is treated as a literal substring to be matched.</p>
<p>If <strong>-r</strong> or <strong>--regex</strong> is given, <em>PATTERN</em> is interpreted as a Perl-compatible regular expression, and <em>REPLACEMENT</em> can contain C-style escape sequences like <strong>t</strong> as well as references to capturing groups by number or name as <em>$n</em> or <em>${n}</em>.</p>
<p>If you specify the <strong>-f</strong> or <strong>--filter</strong> flag then each input string is printed only if a replacement was done. This is useful where you would otherwise use this idiom: <code class="docutils literal notranslate"><span class="pre">a_cmd</span> <span class="pre">|</span> <span class="pre">string</span> <span class="pre">match</span> <span class="pre">pattern</span> <span class="pre">|</span> <span class="pre">string</span> <span class="pre">replace</span> <span class="pre">pattern</span> <span class="pre">new_pattern</span></code>. You can instead just write <code class="docutils literal notranslate"><span class="pre">a_cmd</span> <span class="pre">|</span> <span class="pre">string</span> <span class="pre">replace</span> <span class="pre">--filter</span> <span class="pre">pattern</span> <span class="pre">new_pattern</span></code>.</p>
<p>If <strong>--max-matches MAX</strong> or <strong>-m MAX</strong> is used, <code class="docutils literal notranslate"><span class="pre">string</span> <span class="pre">replace</span></code> will stop all processing after MAX lines of input have matched the specified pattern. In the event of <code class="docutils literal notranslate"><span class="pre">--filter</span></code> or <code class="docutils literal notranslate"><span class="pre">-f</span></code>, this means the output will be MAX lines in length. This can be used as an “early exit” optimization when processing long inputs but expecting a limited and fixed number of outputs that might be found considerably before the input stream has been exhausted.</p>
<p>Exit status: 0 if at least one replacement was performed, or 1 otherwise.</p>
</section>
<section id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Link to this heading">¶</a></h2>
<section id="replace-literal-examples">
<h3>Replace Literal Examples<a class="headerlink" href="#replace-literal-examples" title="Link to this heading">¶</a></h3>
<div class="highlight-fish-docs-samples notranslate"><div class="highlight"><pre><span></span><span class="gp">>_ </span><span class="nf">string</span><span class="w"> </span><span class="no">replace</span><span class="w"> </span><span class="no">is</span><span class="w"> </span><span class="no">was</span><span class="w"> </span><span class="s1">'blue is my favorite'</span>
<span class="go">blue was my favorite</span>
<span class="gp">>_ </span><span class="nf">string</span><span class="w"> </span><span class="no">replace</span><span class="w"> </span><span class="no">3rd</span><span class="w"> </span><span class="no">last</span><span class="w"> </span><span class="no">1st</span><span class="w"> </span><span class="no">2nd</span><span class="w"> </span><span class="no">3rd</span>
<span class="go">1st</span>
<span class="go">2nd</span>
<span class="go">last</span>
<span class="gp">>_ </span><span class="nf">string</span><span class="w"> </span><span class="no">replace</span><span class="w"> </span><span class="no">-a</span><span class="w"> </span><span class="s1">' '</span><span class="w"> </span><span class="no">_</span><span class="w"> </span><span class="s1">'spaces to underscores'</span>
<span class="go">spaces_to_underscores</span>
</pre></div>
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</section>
<section id="replace-regex-examples">
<h3>Replace Regex Examples<a class="headerlink" href="#replace-regex-examples" title="Link to this heading">¶</a></h3>
<div class="highlight-fish-docs-samples notranslate"><div class="highlight"><pre><span></span><span class="gp">>_ </span><span class="nf">string</span><span class="w"> </span><span class="no">replace</span><span class="w"> </span><span class="no">-r</span><span class="w"> </span><span class="no">-a</span><span class="w"> </span><span class="s1">'[^\d.]+'</span><span class="w"> </span><span class="s1">' '</span><span class="w"> </span><span class="s1">'0 one two 3.14 four 5x'</span>
<span class="go">0 3.14 5</span>
<span class="gp">>_ </span><span class="nf">string</span><span class="w"> </span><span class="no">replace</span><span class="w"> </span><span class="no">-r</span><span class="w"> </span><span class="s1">'(\w+)\s+(\w+)'</span><span class="w"> </span><span class="s1">'$2 $1 $$'</span><span class="w"> </span><span class="s1">'left right'</span>
<span class="go">right left $</span>
<span class="gp">>_ </span><span class="nf">string</span><span class="w"> </span><span class="no">replace</span><span class="w"> </span><span class="no">-r</span><span class="w"> </span><span class="s1">'\s*newline\s*'</span><span class="w"> </span><span class="s1">'\n'</span><span class="w"> </span><span class="s1">'put a newline here'</span>
<span class="go">put a</span>
<span class="go">here</span>
</pre></div>
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