combining regex in c++

Question

I want to replace everything in a line except for alphabets, numbers and periods with whitespaces in c++.

Could anyone please give me a regex in c++ that I can use ?

I was using [^[:alnum:]] till now but that works only for alpha and numeric.

Thank you !

except for alphabets, numbers and periods with whitespaces ... can you show us an example? — Tim Biegeleisen
– Tim Biegeleisen, Commented Oct 11, 2016 at 1:31
I think you just need to add a period to your character class: [^[:alnum:].] — Galik
– Galik, Commented Oct 11, 2016 at 1:33
@TimBiegeleisen I can't check it at the moment but I thought inside [] only [, ], - and `\` needed escaping. — Galik
– Galik, Commented Oct 11, 2016 at 1:42

Pete Becker · Accepted Answer · 2016-10-11 02:15:54Z

2

std::replace_if(line.begin(), line.end(),
    [](char ch){ return !isalnum(ch) && ch != '.'; }, ' ');

No need to argue about escapes.

answered Oct 11, 2016 at 2:15

Pete Becker

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Tim Biegeleisen · Accepted Answer · 2016-10-11 02:02:12Z

2

I'm not a C++ person, but you can try adding dots to the regex:

[^[:alnum:].]

An alternative:

[^a-zA-Z0-9.]

edited Oct 11, 2016 at 2:02

answered Oct 11, 2016 at 1:34

Tim Biegeleisen

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1 Comment

Casimir et Hippolyte Over a year ago

I think that Gayathri Jeyaram want to replace all that isn't an (alphanumeric or a dot) with white-space (probably a space), I'm not sure you need to include \s.

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