43 lines
1.3 KiB
TypeScript
43 lines
1.3 KiB
TypeScript
export class StringExtend {
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/**
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* 去除字符串【开头和结尾】的指定字符
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* @param str 原始字符串
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* @param char 要删除的字符（单个）
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*/
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static trim(str: string | null | undefined, char: string): string {
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if (!str) return ''
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if (char.length !== 1) return str
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const escaped = this.#escapeRegChar(char)
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return str.replace(new RegExp(`^${escaped}+|${escaped}+$`, 'g'), '')
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}
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/**
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* 仅去除字符串【开头】的指定字符
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*/
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static trimStart(str: string | null | undefined, char: string): string {
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if (!str) return ''
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if (char.length !== 1) return str
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const escaped = this.#escapeRegChar(char)
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return str.replace(new RegExp(`^${escaped}+`, 'g'), '')
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}
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/**
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* 仅去除字符串【结尾】的指定字符
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*/
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static trimEnd(str: string | null | undefined, char: string): string {
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if (!str) return ''
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if (char.length !== 1) return str
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const escaped = this.#escapeRegChar(char)
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return str.replace(new RegExp(`${escaped}+$`, 'g'), '')
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}
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/**
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* 私有：转义正则特殊字符（. * + ? ^ $ 等）
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*/
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static #escapeRegChar(char: string): string {
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return char.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
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}
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} |