Is there a Pdf reader with regular expression search

Solution 1:

pdfgrep, in the repos, isn't exactly a reader and requires use of the terminal but it eliminates the need to first convert the pdf file to a text file and then to open that in a capable text editor:

In addition to the features listed in Synaptic, you can search multiple files and recursively. One big difference from regular grep is that pdfgrep doesn't provide line numbers but page numbers. man pdfgrep has details.

A simple example:

pdfgrep -in PATTERN FILENAME

Here, i is for case-insensitivity and n gives the page number, not line number.

An example of the output looks like:

There's a brief YouTube video, Pdfgrep - Search Text Inside PDF Files - Linux CLI , as well.