regex - Two regular expressions in C# - what's the difference? -

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this question has answer here:

what difference between following regular expressions

write(?:line)?

and 

write(line)?

i asking for:

  1. understand concept
  2. need write regular expression match following variations word international:int,tntl,international

a group ?: non capturing group meaning not included in result.

//will match "writeline" or "write", ignore line in result write(?:line)?  //*match* -> *captured as*  //writeline -> write //write -> write 
//will match "writeline" or "write" write(line)?  //*match* -> *captured as*  //writeline -> writeline //write -> write

regex #2

correct me if didn't understand correctly.

if want replace int or tntl international, :

var result = regex.replace("international:int,tntl,international","(int(ernational)?|tntl)","international"); // "international:int,tntl,international" -> // "international:international,international,international"

the pipe symbol | serve or operator regular expression.

(international|int|tntl)

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