How is this better than other tools?

Most tools start with the regular expression, and provide a graphical interface instead of a text based interface to allow you to build it. It's just as cumbersome and difficult as typing the regular expression into an editor. I've never seen the big advantage. Txt2regex on the other hand takes a fundementally different approach - it starts with the string to be searched.

Another site that has a similar functionality is https://regex-generator.olafneumann.org.

I've added quite a few more patterns, including Unicode text (including the smiley subset). It can also detect whether the input is Chinese or Arabic character. The original txt2re.com could not detect unicode strings.