RegEx：如果未找到特定模式，则匹配第一行或唯一行的模式

Question

I have written a RegEx pattern to match everything before the first occurrence of either a dot (.) or a comma (,).

RegEx.Match(input, @"(.*?)(?=,|\.)").Value;

But in case a dot or comma does not occur in the input, then I would want the RegEx to return the entire string.

Example:

Input : "Freeze, Police."

Output : "Freeze"

Input : "Aim. Fire"

Output : "Aim"

Input : "Roger that"

Output (expected) : "Roger that"

Could someone suggest me how should I change my RegEx pattern ?

Answer 1

Add enter marks in your regexp,

((.|\r|\n)*?)(?=,|\.|$)

In regex "." does not include neither "New line" or "Carriage Return" And for end of the line use $

And of course, if you don't want to process data in multi lines then just use this.

(.*?)(?=,|\.|$)