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JS regular matching first assertion and last assertion

2022-04-23 06:53:00 【zjLOVEcyj】


//  Matches only appear in y hinder x  Follow closely y hinder x
console.log(/(?<=y)x/.exec('acyx'));

//  Only matches do not appear in y hinder x
console.log(/(?<!y)x/.exec('asax'))

//  Matches only appear in y Ahead x
console.log(/x(?=y)/.exec('xyqqa'));

//  Only matches do not appear in y Ahead x
console.log(/x(?!y)/.exec('zsxsary'));