package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?>\\caption(?:of)?\b[^{]*{|(?<!^)\G)(?>[^}{]|(\{(?:[^}{]*+|(?-1))*}))*?\K\\{2}`)
var str = ` \begin{figure}
\includegraphics{pic.pdf}
\caption[]{My caption \\
Source: XYZ}
\label{fig:pic_1}
\end{figure}
\begin{figure}[H]
\includegraphics{pic.pdf}
\captionof[]{My caption \\ xyz \\ abc
\label{fig:pic_1} }
\end{figure}
\begin{figure}[H]
\includegraphics{pic.pdf}
\caption[]{My caption {with extra brackets}
Source: XYZ}
\label{fig:pic_1}
\end{figure}
\begin{figure}[H]
\includegraphics{pic.pdf}
\caption[]{My caption}
\end{figure}
Some text\\ %% This \\ should not be changed, it's not within a caption
More text
\begin{figure}[H]
\includegraphics{pic.pdf}
\caption[]{My caption \\ Source: XYZ}
\label{fig:pic_1}
\end{figure}`
var substitution = "\\par"
fmt.Println(re.ReplaceAllString(str, substitution))
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/