[SOLVED] How to exclude all speacial characters using regex?
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Show your own efforts when posting, and do basic research. After three years, you should have SOME scripting/research skills.
Putting "bash regex strip out anything but letters and numbers" into Google pulls up a LOT of 'hints'. You've been told many times to post things in CODE tags, but don't seem to follow that advice either. The [:alnum:] is alpha-numeric.
Show your own efforts when posting, and do basic research. After three years, you should have SOME scripting/research skills.
Putting "bash regex strip out anything but letters and numbers" into Google pulls up a LOT of 'hints'. You've been told many times to post things in CODE tags, but don't seem to follow that advice either. The [:alnum:] is alpha-numeric.
I understand and I am definitely trying to get the answer and of course everyone first tries google which I also did and if that didnt resolve then come here.
You need to escape certain characters inside the RegEx:
Code:
while read -r line;do
if [[ ! "$line" =~ [][()\'\"~!\`@/?\>\<\\] ]];then
echo "$line"
fi
done < "/path/to/file"
The above code takes care of the most problematic ones. Notice, that if you want to match a literal ']' inside the brackets then it must be the first character after the opening '['.
I will leave matching the remaining characters as an excercise.
PS:
You can also achieve this by using [:alnum:] by TB0ne but it has also a pitfall. I think, however, that doing it the "hard" way is more educational in the long run since you can learn how to handle certain characters in a RegEx.
Last edited by crts; 07-18-2019 at 08:54 AM.
Reason: Added PS
I understand and I am definitely trying to get the answer and of course everyone first tries google which I also did and if that didnt resolve then come here. Will definitely ensure to follow the code tags.
Sorry, just don't believe that. Putting the search term I used into Google yielded 559,000 hits....hard to believe that out of all that there wasn't one 'hint' you could have used. And you've been asked about CODE tags for a LONG time, but don't use them.
Quote:
Originally Posted by blason
Code:
'[!@#%%$^*()_+=\;:,"<>?/]'
I guess I am not able to exclude single quote
And why is that, given the fact that I not only gave you a search-term that has your 'hints', but the **EXACT** thing you need to use for a regex to strip out anything but letters and numbers???
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