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    <p>Assuming that the prompt-escaped string is stored in a variable <code>FOO</code>, this will count only user-visible characters: </p> <pre><code> FOO=$(git_prompt_info) local zero='%([BSUbfksu]|([FK]|){*})' FOOLENGTH=${#${(S%%)FOO//$~zero/}} </code></pre> <p>This comes from <a href="http://ruderich.org/simon/config/zshrc" rel="nofollow noreferrer">this <code>.zshrc</code></a>. </p> <p>This is a <em>rough</em> explanation of why it works, liberally quoting from <a href="http://linux.die.net/man/1/zshexpn" rel="nofollow noreferrer"><code>man zshexpn</code></a>, section <code>PARAMETER EXPANSION</code>. I'm not 100% sure of the details, so, if you're using this to develop your own equivalent, read the relevant <code>man zshall</code> sections. </p> <p>Working from the line <code>FOOLENGTH=${#${(S%%)FOO//$~zero/}}</code>, we've got a number of bits. Going from the inside out: </p> <ol> <li><p><code>$~zero</code>: The <code>~</code> ensures that <code>zero</code>, which we've defined as <code>'%([BSUbfksu]|([FB]|){*})'</code>, is treated as a pattern rather than as a plain string. </p></li> <li><p><code>${(S%%)FOO//$~zero/}</code>: This matches <code>${name//pattern/repl}</code>: </p> <blockquote> <p>Replace the longest possible match of pattern in the expansion of parameter name by string repl </p> </blockquote> <p>Note that we don't have a <code>repl</code>; we replace the longest possible match of <code>pattern</code> with nothing, thereby removing it.<br> <code>(S%%)FOO</code> conducts an expansion on <code>FOO</code> with several flags set. I don't quite follow it. </p></li> <li><p><code>${#${(S%%)FOO//$~zero/}}</code>: <code>${#spec}</code> will substitue the length in characters of the result of the substitution <code>spec</code>, if <code>spec</code> is a substitution. In our case, <code>spec</code> is the result of the substitution <code>${(S%%)FOO//$~zero/}</code>; so this basically returns the length of characters in the result of the regular expression <code>s/zero//</code> on <code>FOO</code>, where <code>zero</code> is the pattern above. </p></li> </ol>
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    1. CO`(S)` makes matching non-greedy thus turning “longest possible match” into “shortest possible match” (without it `{*}` in a pattern will turn thing like `%F{blue}%M%F{yellow}%#%f` into just `%#`, while it should turn it into `%M%#`), `(%%)` performs prompt expansion on the string, following PROMPT_* options. Note: this method should be avoided if PROMPT string contains a command with some side-effects: for example, if you want to use it to count how often the prompt is shown. Most of time you won’t suffer from this.
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    2. COAnd yes, all `(*)` flags are described in PARAMETER EXPANSION section of `man zshexpn`.
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    3. CO@ZyX Thanks. I saw the explanation for `S` in the `zshexpn` page, but wasn't sure how it fitted in.
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