Regular expressions

The 4 definitions of the regular expressions library, each with its Epsil spelling, its MathJSON name, its signature and its full description.

Each definition is listed under its Epsil spelling (the MathJSON name when it has none), with its signature in the engine's type syntax. The Standard Library page is the one-page index of every category.

Definitions

isMatch

MathJSON IsMatch · (subject: string, pattern: regexp) -> boolean

Whether a string contains a match for a regular expression.

regExp

MathJSON RegExp · (pattern: string, flags: string?) -> regexp

A compiled regular expression, using the host JavaScript dialect.

The pattern is written most readably as a raw string literal: RegExp(#"[0-9]+"#).

stringMatch

MathJSON StringMatch · (subject: string, pattern: regexp) -> nothing | record

The first match of a regular expression in a string, as a record.

The record holds match, range, groups and names; the result is Nothing when there is no match.

stringMatchAll

MathJSON StringMatchAll · (subject: string, pattern: regexp) -> list<record>

Every non-overlapping match of a regular expression in a string, as a list of records.

Each record has the same shape as StringMatch.