MVC C# single regex to validate curly braces and angle brackets

Question

I am trying to make a spinner for one of my projects, and I have a text area and I want to validate text if curly braces are closed and text don't have angle brackets.

So far I am able to check if text has any angle brackets present with [^<>]*

I have this string {hello|hi|hey} arbaz, {how are you?|how you doing} and i want to validate if curly braces is closed correctly. for example string can't be

{{hello|hi|hey}} arbaz, {{how are you?|how you doing}}

OR

{{hello|hi|hey} arbaz, {how are you?|how you doing}}

it can't be wrap in curly brackets.

\\{{?>\\{{?<c>}|[^{}]+|\\}{?<-c>}}*{?{c}{?!}}\\} is my regex so far.

I need a regex which can validate with curly braces and don't allow the angle brackets. Please forgive me for my bad English. Thanks

Answer 1

You want to match a string that contains either chars other than { and } OR {...} substrings and none of these can also match < and > chars.

You may use

^(?:[^<>{}]|{[^<>{}]*})*$

See the regex demo

It matches:

• ^ - start of string
• (?: - start of a non-capturing group
  • [^<>{}] - any char but < , > , { and }
  • | - or
  • { - a {
  • [^<>{}]* - 0+ chars other than < , > , { and }
  • } - a } char
• )* - repeat the group pattern 0+ times
• $ - end of string.