Differences in regex syntax in Python and Java

Question

I have a following working regex in Python and I am trying to convert it to Java, I thought that regex works the same in both languages, but obviously it doesn't.

Python regex: ^\d+;\d+-\d+

My Java attempt: ^\\d+;\\d+-\\d+

Example strings that should be matched:

3;1-2,2-3
68;12-15,1-16,66-1,1-2

What is the right solution in Java?

Thank you, Tomas

There are quite a few significant differences between Python and Java, but your regex doesn't manage to stumble on any of them. — tchrist
– tchrist, Commented Oct 29, 2010 at 1:00

steinar · Accepted Answer · 2010-10-29 00:11:42Z

2

The regex is faulty for the input, don't know what you were doing in Python, but this isn't matching the whole strings in any regex I know.

This should do the trick (escaping characters are omitted):

^\d+;(\d+-\d+,?)+

I.e. you need to continue matching the number pairs separated by commas.

answered Oct 29, 2010 at 0:11

steinar

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1 Comment

Tomas Novotny Over a year ago

Thank you, I don't need to match the whole string, I just test if the pattern is in the string, so I test only for the first pair separated by a comma and that is sufficient for me.

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