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- /** Returns a regular expression quantifier with an upper and lower limit. */
- export function limit(lower, upper)
- {
- if ((lower < 0) || (upper <= 0) || (upper < lower)) {
- throw new TypeError()
- }
- return `{${lower},${upper}}`
- }
- /**
- * Trims away any characters after the first match of {@code pattern} in {@code candidate},
- * returning the trimmed version.
- */
- export function trimAfterFirstMatch(regexp, string)
- {
- const index = string.search(regexp)
- if (index >= 0) {
- return string.slice(0, index)
- }
- return string
- }
- export function startsWith(string, substring)
- {
- return string.indexOf(substring) === 0
- }
- export function endsWith(string, substring)
- {
- return string.indexOf(substring, string.length - substring.length) === string.length - substring.length
- }
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