Quantifiers

Quantifiers in regex define the number of occurrences to match for a pattern.

zeroOrMore()

function zeroOrMore(
  sequence: RegexSequence,
  options?: {
    greedy?: boolean; // default=true
  },
): RegexConstruct;

Regex syntax:

• x* for default greedy behavior (match as many characters as possible)
• x*? for non-greedy behavior (match as few characters as possible)

The zeroOrMore quantifier matches zero or more occurrences of a given pattern, allowing a flexible number of repetitions of that element.

oneOrMore()

function oneOrMore(
  sequence: RegexSequence,
  options?: {
    greedy?: boolean; // default=true
  },
): RegexConstruct;

Regex syntax:

• x+ for default greedy behavior (match as many characters as possible)
• x+? for non-greedy behavior (match as few characters as possible)

The oneOrMore quantifier matches one or more occurrences of a given pattern, allowing a flexible number of repetitions of that element.

optional()

function optional(
  sequence: RegexSequence,
  options?: {
    greedy?: boolean; // default=true
  },
): RegexConstruct;

Regex syntax:

• x? for default greedy behavior (match as many characters as possible)
• x?? for non-greedy behavior (match as few characters as possible)

The optional quantifier matches zero or one occurrence of a given pattern, making it optional.

repeat()

function repeat(
  sequence: RegexSequence,
  options:
    | number
    | {
        min: number;
        max?: number;
        greedy?: boolean; // default=true
      },
): RegexConstruct;

Regex syntax:

• x{n}, x{min,}, x{min, max} for default greedy behavior (match as many characters as possible)
• x{min,}?, x{min, max}? for non-greedy behavior (match as few characters as possible)

The repeat quantifier in regex matches either exactly count times or between min and max times. If only min is provided, it matches at least min times.