Javascript正则表达式只允许数字和浮点数

Question

I have below code for replace anything apart from number/ float from a string.

const parseNumbers = strInput => strInput
  .trim()
  .replace(/^[@#$%^&*()_+}{|{}[\]/<>,.;'"`~a-z!]*/gi, '')
  .replace(/[^0-9]+[.][0-9]*/g, "");

The following strings are not working with the above regex:

'644322.abc'

While this works '644322.abc.....' gets converted to 644322

'644322.12ac.....' gets converts to 644322.12

But this does not:

'644322.12ac' gets converted to 644322.12ac

'644322.12-1' remains as is 644322.12-1

I want to replace all characters which are not numbers and keep values as number or float.

Answer 1

Can you give an example string? Here is one made up from your question.

 let input = "I have below code for replace anything apart from number/ float from a string.The following strings are not working with the above regex:'644322.abc'While this works '644322.abc.....' gets converted to 644322'644322.12ac.....' gets converts to 644322.12But this does not:'644322.12ac' gets converted to 644322.12ac'644322.12-1' remains as is 644322.12-1" let re = /[+-]?([0-9]*[.])?[0-9]+/g let m = input.match(re); console.log(m)

Answer 2

You can remove all chars other than digits and dots first, and then remove all dots other than the first one (unless that first dot is at the end of the string) and use

 const texts = ['644322.abc', '644322.12ac.....', '644322.12ac', '644322.12-1']; texts.forEach( text => console.log( text, '=>', text.replace(/[^\\d.]+/g, '').replace(/^([^.]*\\.)(?!$)|\\./g, '$1') ))

Details :

• .replace(/[^\\d.]+/g, '') - removes all chars other than digits and dots
• .replace(/^([^.]*\\.)(?!$)|\\./g, '$1') - removes all dots other than the first one that is not at the end of string.