Can anyone help me understand why this doesn't work? Just trying out some simple regex in bash.
#!/bin/bash
re="-regex_"
if [[ "$re" =~ ^[-[:alpha:]_]+$ ]]; then
echo "Regex"
else
echo "this is not regex"
fi
Cheers
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On mine it does nothing, no error or anything.jimmy Light– jimmy Light2014-03-28 20:11:01 +00:00Commented Mar 28, 2014 at 20:11
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1What is your BASH version?anubhava– anubhava2014-03-28 20:20:37 +00:00Commented Mar 28, 2014 at 20:20
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2 Answers
I am assuming that you are hoping that the "-regex_" will evaluate to true in your if statement.
on the [:alpha:] tag there is nothing to say search for more than one alpha-numeric character.
try
[[ "$re" =~ ^-[[:alpha:]]+_$ ]]
10 Comments
jimmy Light
I've followed you're example and still nothing. I have the permissions set and I'm in the right folder.
nick
did you use the edited one? the first one i posted had a mistake in it... love regexes -_-
jimmy Light
I just tried it and still nothing, very strange. Any ideas?
nick
You are having an issue with running bash and not just regex. The comments are right that your original solution should return Regex, my solution has more to do with matching data which starts with - and ends with _. Try looking at your BASH version and see if the syntax you are using is valid. When you run the script it returns "this is not regex" right?
jimmy Light
It returns nothing, no error or anything, just moves onto the next line as if nothing happened. BASH version 4.1.2
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If you are having an error running it, make sure you are using unix line endings (run it through dos2unix) and make sure it is marked executable. Otherwise, the script prints "Regex" for me.
