I'm not sure you are being fair. I think any frequent user of regex understands how easy it is to produce expressions that are very difficult to parse.
I also think that a discussion about readability makes sense in a post about Bash. I don't personally program very often in Lua, Go or Ruby, but for the most part when I encounter code in these languages I don't find it very difficult to understand and modify. In contrast to this, every encounter with a significant amount of Bash seems to lead to a great deal of googling.
I haven't said anything about regexes here. What I wrote is that I find the shorthand "non human readable" specifically to be objectionable. Are regexes sometimes difficult? Sure. Are people who read bash also human? Yes, and that's my point. I hope that point is fair.
I also think that a discussion about readability makes sense in a post about Bash. I don't personally program very often in Lua, Go or Ruby, but for the most part when I encounter code in these languages I don't find it very difficult to understand and modify. In contrast to this, every encounter with a significant amount of Bash seems to lead to a great deal of googling.