Extract substring as number from string typescript

Question

This is the format of the string:

I want to extract the Revision number from the name. I tried using Substring() but I need a generic solution that could extract out Revision number from any name in this format. This is how the name is being set is the backend:

Thanks in advance.

So the "Revision" word can be translated? You're left with the parenthesis and the number to recognize the pattern, isn't it a bit too fragile? That being said I've provided an answer. — Guerric P
– Guerric P, Commented Mar 11, 2022 at 11:30

Guerric P · Accepted Answer · 2022-03-11 12:33:17Z

1

You could use a regex with a capturing group like this:

const input = 'Access2 - changed - (Revision 2)';

const regex = /^.*\(\w+\s(\d+)\)$/;

const [, revision] = regex.exec(input);

console.log(revision);

edited Mar 11, 2022 at 12:33

answered Mar 11, 2022 at 11:21

Guerric P

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2 Comments

Mellionis Over a year ago

May I please know what does the regex group target?

Guerric P Over a year ago

the capturing group (unescaped parenthesis) surrounds the decimals that you need to retrieve, the result is an array with the full match, then the capturing group match. It retrieves the revision number when the input string is in the form of any characters(anyletters 123) where 123 can be one or more decimals

Virhile · Accepted Answer · 2022-03-11 11:25:18Z

0

You can try this

const [,revisionNumber] = value.match(/Revision (\d)/)

answered Mar 11, 2022 at 11:25

Virhile

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2 Comments

Mellionis Over a year ago

Won't it throw exception when value is an empty string?

Virhile Over a year ago

It will, to prevent that you can add || [] at the end of the line, then revisionNumber will simply be undefined

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