On, Mac OS X I'm trying to use expr to extract an IP address from a URL string.
expr tcp://192.168.59.103:2376 : '^\([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\)'
This returns an empty string.
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MoxieandMore
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1Hint: your string starts with `tcp://`, your regular exression does not. – user16538 May 06 '15 at 19:42
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Thanks for the hint. I realized that expr was looking at the front of the string. I ended up going with: `echo ${URL:6:14}` – MoxieandMore May 06 '15 at 20:54