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[英]What's special about a “space” character in an “expr match” regexp?
[英]what does this sed expr. match actually? s/^.*EngineLog ERROR://
sed表达式s /^.* EngineLog错误://
它匹配任何以0个或多个字符开头的字符,然后匹配EngineLog错误:然后将其替换为空
示例全部输出相同: EngineLog错误:
:
1EngineLog ERROR:
1 EngineLog ERROR:
EngineLog ERROR:
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