regular expression problem

[lambertb]

Hi all,

my knowledge on regular expression is average. I have this one in
asp.net :

^\d+(\.\d\d?)?

To my eyes, it correctly validates any whole number (ex: 1, 100), and
any decimal number with one or two decimals (42.0, 42.42, 420.42, etc.)

Why is in javascript, declared like that :

var regex = /^\d+(\.\d\d?)?/

outputs this :

regex.text('abc') // outputs false, correct
regex.test('42er') // outputs true, INCORRECT (chars are alpha)
regex.test('42.420') // outputs true, INCORRECT (3 digits after
point)

Anyone have suggestions please?

Thanks!

ibiza

 

[Evertjan.]

wrote on 20 jan 2006 in comp.lang.javascript:

Hi all,

my knowledge on regular expression is average. I have this one in
asp.net :

^\d+(\.\d\d?)?

To my eyes, it correctly validates any whole number (ex: 1, 100), and
any decimal number with one or two decimals (42.0, 42.42, 420.42, etc.)

Why is in javascript, declared like that :

var regex = /^\d+(\.\d\d?)?/

var regex = /^\d+(\.\d\d?)?$/

outputs this :

regex.text('abc') // outputs false, correct
regex.test('42er') // outputs true, INCORRECT (chars are alpha)
regex.test('42.420') // outputs true, INCORRECT (3 digits after
point)

This will include negative values:

var regex = /^-?\d+(\.\d\d?)?$/