regexp for finding floats in a string

[Bil Kleb]

What RegExp should I be using for floats?

Currently, I have /[-+0-9eE.]+/, viz,

require 'test/unit'
class TestFloatRegExp < Test::Unit::TestCase
def test_finds_em
%w{ 1 -2 3.0 0.4 5.0e+5 -6e+06 .7E+7 }.each do |string|
assert( string.match(/[-+0-9eE.]+/), "no match >>#{string}<<" )
end
end
end

 

[Xavier Noria]

What RegExp should I be using for floats?

Currently, I have /[-+0-9eE.]+/, viz,

require 'test/unit'
class TestFloatRegExp < Test::Unit::TestCase
def test_finds_em
%w{ 1 -2 3.0 0.4 5.0e+5 -6e+06 .7E+7 }.each do |string|
assert( string.match(/[-+0-9eE.]+/), "no match >>#{string}<<" )
end
end
end

Have a look at the regexp in

perldoc -q float

-- fxn

PS: Your mail client runs on a Mac, that works there.

 

[Bil Kleb]

Have a look at the regexp in

perldoc -q float

/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/

Ouch!

Thanks; I think.

Regards,

 

[A LeDonne]

Have a look at the regexp in

perldoc -q float

/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/

Ouch!

Thanks; I think.

Quick caveat - that's for a c float (as mentioned in that perldoc
snippet). Ruby float (& other numeric) literals allow the underscore
character (with restrictions) as well. So really, it depends on
exactly what you're parsing and why.

-A