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