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What is [50-99] in regular expression?

As the slide says, it's not 50-99 characters so what it is?

Source: https://www3.cs.stonybrook.edu/~pfodor/courses/CSE307/L02_Programming_RE.pdf

Also, please tell me how to learn regular expressions? Recommend some university/any courses to take for learning regular expression for backend development. (Not the one we learnt in theory of automata and computation).

There are lots of resources to learn it like regexpal for testing regular expressions, regexone.com for learning it. But how'd you learn it? Like what process do you follow to learn it?

Which book would you recommend out of these? 1) Beginning regular expressions Andrew Watt

2) Introducing regular expressions oreilly

3) Introducing regular expressions oreilly

4) Javascript regular expressions packt

5) Mastering regular expressions oreilly

6) Regular expressions pocket primer

7) Regex quick syntax reference

1 points shivajikobardan 3 years ago 4 comments

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