负面前瞻正则表达式
Negative look ahead regex
如何匹配前面没有 @ 符号的字符串？
/(?!@)(somestring|someotherstring)/
没有产生预期的结果。我在 Sublime: Regular Expressions.cheatsheet
之后的 sublime text 中测试这个
您需要使用 lookbehind:
(?<!@)(somestring|someotherstring)
(?!@) 前瞻将检查 后面的 符号是否不是 @。
一些more details:
Lookbehind has the same effect [VS: as lookahead], but works backwards. It tells the regex engine to temporarily step backwards in the string, to check if the text inside the lookbehind can be matched there. (?<!a)b matches a b that is not preceded by an a, using negative lookbehind. It doesn't match cab, but matches the b (and only the b) in bed or debt.
Negative lookbehind is written as (?<!text), using an exclamation point instead of an equals sign.
如何匹配前面没有 @ 符号的字符串？
/(?!@)(somestring|someotherstring)/
没有产生预期的结果。我在 Sublime: Regular Expressions.cheatsheet
之后的 sublime text 中测试这个您需要使用 lookbehind:
(?<!@)(somestring|someotherstring)
(?!@) 前瞻将检查 后面的 符号是否不是 @。
一些more details:
Lookbehind has the same effect [VS: as lookahead], but works backwards. It tells the regex engine to temporarily step backwards in the string, to check if the text inside the lookbehind can be matched there.
(?<!a)bmatches abthat is not preceded by ana, using negative lookbehind. It doesn't matchcab, but matches theb(and only theb) inbedordebt.Negative lookbehind is written as
(?<!text), using an exclamation point instead of an equals sign.