C# Regex: Replace whitespace into XML tag

Question

I'm looking for a regex to replace whitespaces INTO an XML tag. For exemple:

<TAG 1>bla bla bla</TAG 1>

replace to:

<TAG1>bla bla bla</TAG1>

I wrote this:

string currentLine = Regex.Replace(currentLine,
@"(?<=\</?\S*)\s+(?=\S*\>)", String.Empty);

but it's not working, because it's remove between 2 tag also...

Thank you for your help!

Like this? regex101.com/r/YL2iPP/1

MonkeyZeus
– MonkeyZeus

2021-01-19 19:06:53 +00:00
Commented Jan 19, 2021 at 19:06 — MonkeyZeus
– MonkeyZeus, Commented Jan 19, 2021 at 19:06

Wiktor Stribiżew · Accepted Answer · 2021-01-19 19:18:28Z

1

You should bear in mind that \S matches any non-whitespace character, that is why in case some text is glued to < or > you may match spaces outside of angle brackets.

You can use

var result = Regex.Replace(text, @"(?<=<[^<>]*)\s(?=[^<>]*>)", "");

See the regex demo. Details:

(?<=<[^<>]*) - a location immediately preceded with < and then any zero or more chars other than < and >
\s - a whitespace
(?=[^<>]*>) - a location immediately followed with any zero or more chars other than < and > and then a >.

answered Jan 19, 2021 at 19:18

Wiktor Stribiżew

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1 Comment

kjhughes Over a year ago

Good, +1, but it's noteworthy that this assumes that there are no XML attributes.

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