Golang regex match +-/*

Question

I tried this:

re_operator := regexp.MustCompile("^(+|-|*|/)")

I get this:

panic: regexp: Compile(`^(+|-|*|/)`): error parsing regexp: missing argument to repetition operator: `+`

It's literally impossible to Google an answer to this question, not to mention it varies for every language and version. I'm about to use an if else. Escape sequences are also a pain. Should I try escaping my escape sequence?

Unhelpful answer: Regular expression to match digits and basic math operators

iBug · Accepted Answer · 2018-06-20T02:20:41.780

5

Escape RegEx meta characters:

MustCompile("^(\\+|-|\\*|/)")

Or better yet, use a bracket expression:

MustCompile("^[-+*/]")

Note in bracket expressions you must put the hyphen at first or at last.

edited Jun 20 '18 at 02:20

answered Jun 20 '18 at 02:12

iBug

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Thanks but only the top one works. Will accept answer in mandatory 8 minutes. – asdfasdfasdf Jun 20 '18 at 02:16
@asdf Second one fixed. – iBug Jun 20 '18 at 02:20

Golang regex match +-/*

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