XML regex: Is there any special functions for '-' symbol?

Question

I had been searching a few sources online but none able to tell what this regex term matches for:

regex="^0-"

I knew ^ means starting of the string and 0 is just 0, but what is the meaning of - carrying behind? If it would mean just a literal char -, shouldn't it be written as ^0\- with a slash \ followed by a dash?

Besides, will this regex="Stain" matches both string: Stain and Sub-Stain?

Thanks Chun Meng

Answer 1

regex="^0-" I knew ^ means starting of the string and 0 is just 0, but what is the meaning of '-' carrying behind? If it would mean just a char '-', shouldn't it be written as "^0-" with a slash "\" followed by a dash?

- not a regex special special character. So you don't need to escape - symbol. But you must escape - when it is used within character class. - inside character class acts like a range operator. ex, [0-9]

See also this question.

Besides, will this regex="Stain" matches both string: "Stain" & "Sub-Stain"?

Yes the regex Stain matches the string Stain and also the substring Stain in Sub-Stain