Removing int and float from the end of a string using Javascript regex

Question

I found an answer in this question that is almost perfect but I need a slight tweak. I've read the basics of regex and I'm using https://regex101.com/ but I can't figure it out.

Using "string".replace(/\d+$/, '') I can remove any numbers from the end of the string. However I also need to remove any numbers that have a format with a decimal like #.# or ##.# as well as whole numbers, but only when they appear at the end of the string. From regex101 I have found that the $ is for the end of the string.

I can use .replace(/\d+([.]\d+)?/g) to remove numbers and floats but it removes them from the entire string, not just when they appear at the end, and I can't work out where to put the $ as I don't really understand regex yet and can't get it to work.

It seems such a small and stupid problem but I'd appreciate the help.

Thanks

@WiktorStribiżew thank you, perfect! I don't understand it but it does work, thank you. I will read up more about regex. — Lyall
– Lyall, Commented Jul 13, 2017 at 18:33
Why did you accept an answer that doesn't parse int's/decimals correctly ? (?:\d+(?:\.\d*)?|\.\d+)$ .. -1 — user557597
– user557597, Commented Jul 13, 2017 at 20:06
@sln because I tested it and it worked for me on a live example. — Lyall
– Lyall, Commented Jul 13, 2017 at 20:15

Wiktor Stribiżew · Accepted Answer · 2017-07-13 18:36:12Z

3

You may use

.replace(/\d+(?:\.\d+)?$/, '')

The pattern matches

\d+ - one or more digits
(?:\.\d+)? - a non-capturing group (the ?: makes it non-capturing, that is, you cannot access the value captured by this group) that matches an optional sequence of a . and then 1+ digits
$ - end of string.

To also remove any 0+ whitespaces before the number, add \s* (where \s matches any whitespace and * quantifier makes the regex engine match (consecutively) 0 or more of the characters matched with this pattern) at the pattern start.

See the regex demo.

answered Jul 13, 2017 at 18:36

Wiktor Stribiżew

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1 Comment

Wiktor Stribiżew Over a year ago

Some more reference: $ anchor, non-capturing groups, regex quantifiers.

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