I need to have array from message that contain ETH address from text.

Example text:

You have ining invoice for 0xc7d688cb053c19ad5ee4f48c348958880537835f from 0xc7d688cb053c19ad5ee4f888848958dd0537835f with time spent 18 : 32 and remark test 1

Expected output:

[
 '0xc7d688cb053c19ad5ee4f48c348958880537835f,
 '0xc7d688cb053c19ad5ee4f48c348958880537835f'
]

I need to have array from message that contain ETH address from text.

Example text:

You have ining invoice for 0xc7d688cb053c19ad5ee4f48c348958880537835f from 0xc7d688cb053c19ad5ee4f888848958dd0537835f with time spent 18 : 32 and remark test 1

Expected output:

[
 '0xc7d688cb053c19ad5ee4f48c348958880537835f,
 '0xc7d688cb053c19ad5ee4f48c348958880537835f'
]

• javascript
• regex
• string

• Is there a space after the ETH address? – Sumit Jha Commented Mar 23, 2018 at 14:27
• Does the address have a fixed length, or how can the first one run together with the word "from"? – Arndt Jonasson Commented Mar 23, 2018 at 14:29
• what did you try so far? – guijob Commented Mar 23, 2018 at 14:29
• @SumitJha Yes it has space – Jignesh Aakoliya Commented Mar 23, 2018 at 14:29
• @ArndtJonasson, yes 40 alpha numeric after 0x – Jignesh Aakoliya Commented Mar 23, 2018 at 14:30

2 Answers 2

Use match with following regex (\b0x[a-f0-9]{40}\b):

let str = 'You have ining invoice for 0xc7d688cb053c19ad5ee4f48c348958880537835f from 0xc7d688cb053c19ad5ee4f888848958dd0537835f with time spent 18 : 32 and remark test 1'

let resp = str.match(/(\b0x[a-f0-9]{40}\b)/g)

console.log(resp);

Use regular expression/(0x[a-f0-9]{40})/g;. Here is a fast solution.

const regex = /(0x[a-f0-9]{40})/g;
const str = `You have ining invoice for 0xc7d688cb053c19ad5ee4f48c348958880537835ffrom 0xc7d688cb053c19ad5ee4f888848958dd0537835f with time spent 18 : 32 and remark test 1`;
let m;
let result1 = [];
//Solution 1
while ((m = regex.exec(str)) !== null) {
    // This is necessary to avoid infinite loops with zero-width matches
    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    result1.push(m[0]);
}
console.log(result1);
//Solution 2
let result2 = str.match(regex);
console.log(result2);