Regex for removing a specific BBCode from a string

Question

I\'m trying to write a simple method for removing specific BBCodes from an input string.

For example, where I have an input of:

string input = \"[b]H         


        

Answer 1

Use this simple regex: \[/?{0}\]

Your regex is removing the whole string

• Your regex \[{0}\].*?\[\/{1}\] is removing the entire [b]...[/b] string. That's why you are getting an empty string from the replacement.

• What you need is to remove only the [b] and [b]. In normal regex, this is expressed quite simply with \[/?b\], where the slash is made optional by the ?

• In your parametrized regex, something like \[/?{0}\] will work.

Answer 2

If you sure that both starting and trailing special symbol must occur and you don't want them to be in a result, you can use positive look back ((?<=(your symbols here))) and positive look ahead ((?=(your symbols here))) for specified characters.

Complete answer will look like this:

(?<=(\[{0}\])).*(?=(\[\/{1}\]))

Answer 3

The below regex would capture the string Hello World! inside the second group.

^(.*?)((?<=])[^[]*)(.*)$

DEMO

So replace all your input string with the second captured group.