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Let's take the following MWE:
\documentclass{article}
\usepackage{hyperref,xcolor}
\begin{document}
\href{http://any-URL}{\color{blue}{\underline{Some URL}}}
\end{document}
Let's assume I would like to have every second argument of every \href in the document styled within \color{blue}{\underline{...}.
How would that be possible, via a definition?
\href has to do quite a lot \catcode-magic to handle all the special chars (like #) in urls, so all commands that take an argument and so fix the \catcodes are difficult to insert. You can try the following. But
\href (I hope ...)\ul from soul will not work instead of \uline.Code
\documentclass{article}
\usepackage[colorlinks,allcolors=blue]{hyperref}
\usepackage[normalem]{ulem}
\usepackage{xcolor}
\makeatletter
\begingroup
\catcode`\$=6 %
\catcode`\#=12 %
\gdef\href@split$1#$2#$3\\$4{%
\hyper@@link{$1}{$2}{\uline{$4}}% or \underline
\endgroup
}%
\endgroup
\begin{document}
\href{http://any-URL}{Some URL}
\href{http://any-URL-with#hash}{Some URL}
\href{http://any-URL-with#hash}{\nolinkurl{http://any-URL-with\#}}
\end{document}
A simpler variant of Ulrike's solution, based on my answer to How to be able to use the number sign (#) in the URL of an underlined href
\documentclass{article}
\usepackage{xcolor,soul}
\usepackage{etoolbox}
\usepackage{hyperref}
\hypersetup{colorlinks,urlcolor=blue}
\makeatletter
\patchcmd{\hyper@link@}
{{\Hy@tempb}{#4}}
{{\Hy@tempb}{\ul{#4}}}
{}{}
\makeatother
\begin{document}
\href{https://tex.stackexchange.com/#/!!!}{URL with a number sign}
A hyperlink \href{https://tex.stackexchange.com/#/!!!}{URL with a number sign
and text long enough to trigger a line break} with something following.
\end{document}
Adapting Werner's Lorem ipsum example, another (internal-to-hyperref) possibility is this:
\documentclass{article}
\usepackage{hyperref}
\hypersetup{
allbordercolors=0 0 1,
pdfborderstyle={/S/U/W 1}
}
\begin{document}
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut
\href{http://any-URL}{pellentesque augue} est, id ornare nisi
fringilla eu. Nulla euismod sollicitudin lacus, et porta lectus
accumsan ut. Vestibulum quis interdum lorem. Sed sodales fermentum
neque eu auctor. Vestibulum vitae eros nec massa ultricies
\href{http://any-URL}{sodales vel vitae} justo. Integer a mauris
lectus. Aliquam eu diam vehicula velit lacinia congue. Sed ac mollis
arcu, eu viverra dui. Nunc at elit mi. Duis elementum pulvinar
placerat. Phasellus vel massa varius quam mattis fermentum sed mollis
arcu. \href{http://any-URL}{Vestibulum ante ipsum primis in} faucibus
orci luctus et ultrices posuere cubilia Curae; Aenean dolor elit,
consequat nec tellus luctus, vestibulum fermentum orci. Nullam nec leo
eros. Nullam at quam a mauris luctus euismod ac eu dolor.
\end{document}
href's, not under-lines; or is that a .PDF-viewer-specific effect?
.dvi file). With Ghostscript, I see a blue box; with qpdfview, I see a red box; and with mupdf, I see no line or box. Note that one advantage of this approach is that you can print the file and not have the lines or boxes appear; but the downside is, I guess, that not all PDF viewers implement the PDF standard in the same way (or to the same degree).
hyperref developer stops by this question, however, I'm sure you'll get a very detailed and accurate answer to your question.
You can set a specific style using something like this:
\documentclass{article}
\usepackage{hyperref,xcolor,soul}
\let\oldhref\href
\renewcommand{\href}[2]{\oldhref{#1}{\hrefstyle{#2}}}
\newcommand{\hrefstyle}[1]{\color{blue}\ul{#1}}
\begin{document}
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut \href{http://any-URL}{pellentesque augue} est,
id ornare nisi fringilla eu. Nulla euismod sollicitudin lacus, et porta lectus accumsan
ut. Vestibulum quis interdum lorem. Sed sodales fermentum neque eu auctor. Vestibulum
vitae eros nec massa ultricies \href{http://any-URL}{sodales vel vitae} justo. Integer a mauris lectus. Aliquam
eu diam vehicula velit lacinia congue. Sed ac mollis arcu, eu viverra dui. Nunc at elit
mi. Duis elementum pulvinar placerat. Phasellus vel massa varius quam mattis fermentum
sed mollis arcu. \href{http://any-URL}{Vestibulum ante ipsum primis in} faucibus orci luctus et ultrices
posuere cubilia Curae; Aenean dolor elit, consequat nec tellus luctus, vestibulum
fermentum orci. Nullam nec leo eros. Nullam at quam a mauris luctus euismod ac eu dolor.
\end{document}
Opting for \ul (from soul) instead of \underline. See Why does underlined text not get wrapped once it hits the end of a line ?.
/href can not contain a number sign (#) Please try to find a fix? (cf. How to be able to use the number sign (#) in the URL of an underlined href).
\mbox{#1}. Now it works like a charm.
Aug 16 at 10:52
Here is the code to add at the start of your document for reference in darkgreen.
\usepackage{xcolor}
\usepackage{hyperref}
\definecolor{darkgreen}{rgb}{0.06, 0.78, 0.3}
\hypersetup{ % reference colors
colorlinks=true,
linkcolor=darkgreen,
pdfborder = {0 0 0},
filecolor=magenta,
urlcolor=cyan,
}
\hypersetup{linkcolor=black}
\underlinewould not be optimal as it does not allow line-breaking.\hypersetup{allbordercolors=0 0 1, pdfborderstyle={/S/U/W 1}}. That's for all border colors. There are also:citebordercolor,filebordercolor,linkbordercolor,menubordercolor,urlbordercolor, andrunbordercolorfor a more fine-grained approach.