我想在给文本着色时自动跳过标点符号。目前我的解决方案是手动给文本着色，但对于标点符号较多的长篇文章来说，这样做不太优雅。我不需要所有的单词都是红色的，但各种颜色都是可以的。
\documentclass{article}
\usepackage{xcolor}
\begin{document}
{\color{red}{This is a text}}, {\color{red}{this is a text}}, {\color{red}{this is a text}}! {\color{red}{This is a text}}, {\color{red}{this is a text}}.
\end{document}
答案1
expl3 regex 正则表达式可以进行标点符号。
这里，在一个专用的彩色环境中：
平均能量损失
\documentclass{article}
\usepackage{xcolor}
\usepackage{xparse}
\ExplSyntaxOn
\NewDocumentEnvironment { punct } { o +b } {
\IfNoValueTF {#1}
{
\color{red}
}
{
\color{#1}
}
\tl_set:Nn
\l_tmpa_tl
{ #2 }
\regex_replace_all:nnN
{ [[:punct:]] } % POSIX punctuation set
{
\cB\{ \c{color}\cB\{ black \cE\} \0 \cE\}
}
\l_tmpa_tl
\tl_use:N
\l_tmpa_tl
}{}
\ExplSyntaxOff
\begin{document}
Outside environment:
This is a text, this is a text, this is a text! This is a text, this is a text.
\begin{punct}
Inside environment:
This is a text, this is a text, this is a text! This is a text, this is a text.
\end{punct}
\begin{punct}[blue]
Inside environment:
This is a text, this is a text, this is a text! This is a text, this is a text.
\end{punct}
\end{document}
如果命令与文本混合在一起，情况就会变得更加复杂。
示例：使用自由格式的颜色和格式，并且\，{并且}不算作标点符号：
平均能量损失
\documentclass{article}
\usepackage{xcolor}
\usepackage{xparse}
\ExplSyntaxOn
\NewDocumentEnvironment { punct } { +b } {
\tl_set:Nn
\l_tmpa_tl
{ #1 }
\regex_replace_all:nnN
{ [\.\,\;\:\!\?] } %
{
\cB\{ \c{color}\cB\{ black \cE\} \0 \cE\}
}
\l_tmpa_tl
\tl_use:N
\l_tmpa_tl
}{}
\ExplSyntaxOff
\newcommand\test{\color{red}This is a text, this \color{green} is a text, this is a text! This \color{brown} \textit{is a text, this} is a text.}
\begin{document}
Outside environment:
\color{red}This is a text, this \color{green} is a text, this is a text! This \color{brown} \textit{is a text, this} is a text.
\begin{punct}
Inside environment:
\color{red}This is a text, this \color{green} is a text, this is a text! This \color{brown} \textit{is a text, this} is a text.
\end{punct}
\end{document}
答案2
您可以使标点符号活跃并将其定义为黑色，但我不会这样做：必然会出现一些问题。
如果不是使每个文本都变成红色，而是使所有内容都变成红色，然后只需在本地将标点符号设置为黑色，则可以大大简化标记。
\documentclass{article}
\usepackage{xcolor}
\newcommand\B{\textcolor{black}}
\begin{document}
{\color{red}
This is a text\B, this is a text\B, this is a text\B! This is a text\B, this is a text\B.
}
\end{document}