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49 lines
1.2 KiB
49 lines
1.2 KiB
3 years ago
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const RE_REGEXP_CHAR = /[\\^$.*+?()[\]{}|]/gu
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const RE_HAS_REGEXP_CHAR = new RegExp(RE_REGEXP_CHAR.source)
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const RE_REGEXP_STR = /^\/(.+)\/(.*)$/u
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/**
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* Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
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* "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
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*
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* @param {string} string The string to escape.
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* @returns {string} Returns the escaped string.
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*/
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function escape(string) {
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return string && RE_HAS_REGEXP_CHAR.test(string)
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? string.replace(RE_REGEXP_CHAR, '\\$&')
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: string
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}
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/**
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* Convert a string to the `RegExp`.
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* Normal strings (e.g. `"foo"`) is converted to `/^foo$/` of `RegExp`.
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* Strings like `"/^foo/i"` are converted to `/^foo/i` of `RegExp`.
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*
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* @param {string} string The string to convert.
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* @returns {RegExp} Returns the `RegExp`.
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*/
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function toRegExp(string) {
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const parts = RE_REGEXP_STR.exec(string)
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if (parts) {
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return new RegExp(parts[1], parts[2])
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}
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return new RegExp(`^${escape(string)}$`)
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}
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/**
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* Checks whether given string is regexp string
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* @param {string} string
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* @returns {boolean}
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*/
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function isRegExp(string) {
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return Boolean(RE_REGEXP_STR.exec(string))
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}
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module.exports = {
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escape,
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toRegExp,
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isRegExp
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}
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