I am trying to do a regex match of port name(Ex: eth1/2/3)
re.match('[eE][tT][hH](\d+)/(\d+)/(\d)', value)
Its catching eth1/2a/1 as error , but not eth1/2/1a.
Can you please help.
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Problem with my regex - not saying the end of string .Thanks Everyone for pointing out the mistake.prath– prath2016-03-28 01:16:07 +00:00Commented Mar 28, 2016 at 1:16
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2 Answers
Try ^[eE][tT][hH]\d+(?:\/\d+){2}$ instead. Demo here
re.match will search for matches at the start of the input string. Since eth1/2/1a matched your pattern at the start (up to the letter a) it would still return a match. To stop that you need to put boundaries at the end of the regex, such as $ to make sure that you've consumed all the input string before a match is determined.
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Wiktor Stribiżew
With
re.match, you do not need ^. Also, / does not have to be escaped.It's happened because in first case 2a part doesn't match your regular expression. And in second case th1/2/1 perfectly match [eE][tT][hH](\d+)/(\d+)/(\d) and additional a symbol does not matter.
If you need to get something without any additional symbols try to add to your pattern $ to match end of string.
re.match('[eE][tT][hH](\d+)/(\d+)/(\d)$', value)
answered Mar 27, 2016 at 21:50
alexander.polomodov
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