what are default options Regex constructors ain t even docum | Stdlib | Kotlinlang

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Mikhail

Mikhail

4 months ago

what are default options?

Regex

constructors ain't even documented..

I guess there are no default options?

Regex

implementation on JVM target uses

Pattern.compile(String)

for compiling patterns without any options.

c

Chris Lee

4 months ago

In that case of creating a regex from a string, correct. The Regex class offers a few constructors, such as

/** Creates a regular expression from the specified [pattern] string and the specified set of [options].  */
    public actual constructor(pattern: String, options: Set<RegexOption>) : this(Pattern.compile(pattern, ensureUnicodeCase(options.toInt())))

allowing creation with options, passed through to Pattern.compile.

Mikhail

Mikhail

4 months ago

Yeah, that's what I mean

I think that

with the default options

part should be removed. Or does it really use some default options on other targets like JS?

c

Chris Lee

4 months ago

it is correctly stated but omits stating what the default options are, assuming that folks know that it’s Pattern.compile under the hood (and what the default options there are).

Mikhail

Mikhail

4 months ago

@Chris Lee that's the point,

Pattern.compile(Striing)

does not introduce default options

c

Chris Lee

4 months ago

it does, implicitly - the default options are none of the available ones.

Mikhail

Mikhail

4 months ago

the default options are none

so?

n

nkiesel

4 months ago

Regex has some default behavior (e.g. matches are case-sensitive by default). This "with the default options" indicates that the resulting Regex object uses these default options. You can changes them either within the pattern (e.g.

(?i)

), or by using the constructor.

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