javascript正则表达式从字符串内容中仅查找带连字符的数字

Question

In Javascript, from a string like this, I am trying to extract only the number with a hyphen. ie 67-64-1 and 35554-44-04. Sometimes there could be more hyphens.

The solvent 67-64-1 is not compatible with 35554-44-04

I tried different regex but not able to get it correctly. For example, this regex gets only the first value.

 var msg = 'The solvent 67-64-1 is not compatible with 35554-44-04'; //var regex = /\\d+\\-?/; var regex = /(?:\\d*-\\d*-\\d*)/; var res = msg.match(regex); console.log(res); 

Answer 1

You just need to add the g (global) flag to your regex to match more than once in the string. Note that you should use \\d+ , not \\d* , so that you don't match something like '3--4'. To allow for processing numbers with more hyphens, we use a repeating -\\d+ group after the first \\d+ :

 var msg = 'The solvent 67-64-1 is not compatible with 23-35554-44-04 but is compatible with 1-23'; var regex = /\\d+(?:-\\d+)+/g; var res = msg.match(regex); console.log(res); 

Answer 2

It gives only first because regex work for first element to test

// g give globel access to find all
var regex = /(?:\d*-\d*-\d*)/g;