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dlclark / regexp2

A full-featured regex engine in pure Go based on the .NET engine
MIT License
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No support for full unicode that is supported by the ECMAScript regex #67

Closed kengleong closed 1 year ago

kengleong commented 1 year ago 
exp, _ := regexp2.Compile("[\u{00061}-\u{0007A}]", regexp2.ECMAScript)
_, err := exp.MatchString(val)
fmt.Println(err.Error())

will end up with this error message

error parsing regexp: [}-u] range in reverse order in [\\u{0007A}-\\u{00061}]

dlclark commented 1 year ago

This should work: exp := regexp2.MustCompile("[\\u{00061}-\\u{0007A}]", regexp2.ECMAScript|regexp2.Unicode)

The original example doesn't work for a few reasons:

  1. Go requires slashes to be escaped in double-quoted strings. \u will be interpreted by the compiler doesn't compile in this context. \\u fixes this
  2. the regex [\u{00061}-\u{0007A}] doesn't work in basic ECMAScript. You must enable Unicode parsing for it to work (the "u" option). This is the same in regexp2--you need to send ECMAScript|Unicode as options for this unicode character parsing to work.