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Editorial Team
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Asked: 2026-05-24T09:49:08+00:00

Need a regular expression to match { and } . Here is my requirement.

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Need a regular expression to match { and }.

Here is my requirement.

If the input is like 

avsg{sdhsd{jh{ashdhas}hdasjhd}

…the output should be 

avsgsdhsdjh{ashdhas}hdasjhd

I have to trim all the occurrences of { and } except if there is a matching } for a {.

EDIT — some further examples:

Nested brackets are not allowed. We allow ‘{‘ and ‘}’ that too only once and we remove all the brackets. Giving some more examples.

1). IN:afhad{adfh}jsdfhd OUT: afhad{adfh}jsdfhd

2). IN:afhad{a{dfh}jsdfhd OUT: afhada{dfh}jsdfhd

3). IN:afh{ad{adfh}jsdf}hd OUT:afhad{adfh}jsdfhd

4). IN:afhad{adfhjsdfhd OUT:afhadadfhjsdfhd

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1 Answer

  1. Editorial Team
    s = Regex.Replace(s, @"([^{}]*(?:\{[^{}]*\}[^{}]*)*)(?:[{}]|$)", "$1");

    [^{}]* matches zero or more of any characters except { or }.

    \{[^{}]*\} matches an opening brace followed by a closing brace, with any number of any characters except braces between them.

    All together, ([^{}]*(?:\{[^{}]*\}[^{}]*)*) matches zero or more non-braces or matched pairs of braces and captures them in group #1, and then (?:[{}]|$) matches the next unpaired brace or the end of the input. Replacing the match with $1 (the contents of group #1) effectively deletes the unpaired brace.

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