how to match/search Metacharacters using RegularExpression?

Question

Created Nov ’21

Replies 2

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Participants 3

Hi, i'm new to ios development. Can someone give some example to how to use the Metacharacters in RegularExpression pattern?

var regex = try! NSRegularExpression(pattern: "[\D]", options:[])

this shows invalid escape sequence in literal error

Boost

Answer 1

Nov ’21

You should escape the escape:

var regex = try! NSRegularExpression(pattern: "[\\D]", options:[])

You could also try using

class func escapedPattern(for string: String) -> String

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Answer 2

DTS Engineer OP

Apple

Nov ’21

A good option here is to use Swift ‘raw string’ syntax. For example:

print("<\t>")
// <   >
print(#"<\t>"#)
// <\t>

In the first case the \t is interpreted as a tab whereas in the second it’s interpreted as \t.

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