I am trying my hand at regex for the first time. The input is a day of the week and a number, like SUNDAY 2 or WEDNESDAY 25. I need a regex to make the output SUN 2 or WED 25, i tried ^.{0,3}\d+ but it does not seem to work. Would someone mind helping me out?

Things to notice: The date can have either 1 or 2 digits

I am trying my hand at regex for the first time. The input is a day of the week and a number, like SUNDAY 2 or WEDNESDAY 25. I need a regex to make the output SUN 2 or WED 25, i tried ^.{0,3}\d+ but it does not seem to work. Would someone mind helping me out?

Things to notice: The date can have either 1 or 2 digits

• javascript
• regex

Share Improve this question Follow edited Feb 23, 2017 at 22:14 IWI asked Feb 23, 2017 at 21:56 IWIIWI 1,60466 gold badges3131 silver badges6161 bronze badges 2

• What is the programming language? – Wiktor Stribiżew Commented Feb 23, 2017 at 21:58
• Search for: \b([a-zA-Z]{3})[a-zA-Z]+(\s+\d{1,2}) and replace by `"$1$2" – anubhava Commented Feb 23, 2017 at 22:00

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3 Answers 3

Sorted by: Reset to default 3

Working example on regexr.: http://regexr./3fcg7

First of all, you're missing the space \s:

^.{0,3}\s?\d+

But, that's still not enough, you need to acknowledge and ignore all the following letters, and then grab only the numbers. You can do this with regex groups. (They're zero based, with Zero being the entire match, then 1,2, etc would be the groups you create):

(^[A-Z]{3})[A-Z]*\s?(\d)+

That's (First group) any capital letter (at the beginning of the string) 3 times, then any capital letter 0 or more times, then a space, then (second group) any digit 1 or more times.

So for SUNDAY 2

Group 0: Entire match

Group 1: SUN

Group 2: 2

how about this one?:

^(\w{3})\D+(\d+)

You can do

^(\w{3})\S+\s+(\d{1,2})

Demo