'Regex for XML Schema

I just need help with a regular expression of a back camera of a mobile phone to put in my XML Schema but just can't seem to get it right. The issue is that some mobile phones have 4 cameras and some just two and I can't come up with a way to capture the whole group in one match and the changes that occur when having more cameras.

These are the strings I'm working with:

  • 50 Mpx (f/1,88) + 13 Mpx (f/2,4) + 5 Mpx (f/2,4)
  • 12 Mpx (f/1,6) + 12 Mpx (f/2,4)
  • 64 Mpx (f/1,8) + 8 Mpx (f/2,3) + 2 Mpx (f/2,4) + 2 Mpx (f/2,4)

And this is the regex I came up with but doesn't match.

(\d+\sMpx\s\(f\/\d\,\d+\))(\s\+\s)*

Would you be able to transform my expression so it captures the strings above?

Thank you so much!

regexxmlnsregularexpression


Solution 1:[1]

The pattern that you tried has 2 capture groups, which you do not need for a match only. As the pattern with Mpx is not repeated, you get separate matches.

The part (\s\+\s)* at the end is optional, and will also match trailing +

To get a single match, you can first match the first part with Mpx and then optionally repeat the + part followed by matching again the first part. In the repetition you can use a non capture group (?: instead.

Note that you don't have to escape the comma, and depending on the regex delimiters you also don't have to escape the forward slash.

\d+\sMpx\s\(f\/\d,\d+\)(?:\s\+\s\d+\sMpx\s\(f\/\d,\d+\))*

Explanation

  • \d+\sMpx\s\(f\/\d,\d+\) Match 1+ digits, whitespace char, (f/, single digit, comma and 1+ digits
  • (?: Non capture group
    • \s\+\s Match + between whitespace chars
    • \d+\sMpx\s\(f\/\d,\d+\) Match the Mpx pattern again
  • )* Close the non capture group and optionally repeat it

See a regex demo.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 The fourth bird

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