Question

我正在尝试从

获取

Call:
lm(formula = y ~ x1 + x2 + x3 + z1 + z2 + z3, data = df)

Residuals:
     Min       1Q   Median       3Q      Max 
-2.76472 -0.56958 -0.02673  0.50188  2.61362 

Coefficients:
            Estimate Std. Error t value Pr(>|t|)  
(Intercept)  0.18092    0.09966   1.815   0.0727 .
x1           0.12282    0.10231   1.201   0.2330  
x2          -0.22411    0.10781  -2.079   0.0404 *
x3          -0.01096    0.09554  -0.115   0.9090  
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.9596 on 93 degrees of freedom
Multiple R-squared:  0.07717,   Adjusted R-squared:  0.01763 
F-statistic: 1.296 on 6 and 93 DF,  p-value: 0.2667

的子字符串

The access token provided is invalid

我正在做的是

Access to the requested resource path is unauthorized: v1/streaming/video/558489e46b66d1023309e1a1 [The access token provided is invalid]

但NSError *err = nil; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[(.*)]" options:0 error:&err]; NSString *message = nil; if (regex) { NSTextCheckingResult *result = [regex firstMatchInString:(NSString*)error.userInfo[@"NSLocalizedDescription"] options:0 range:NSMakeRange(0, ((NSString*)error.userInfo[@"NSLocalizedDescription"]).length)]; if ( result ) { NSRange range = [result rangeAtIndex:1]; message = [((NSString*)error.userInfo[@"NSLocalizedDescription"]) substringWithRange:range]; } }为零。我的想法是在message之间找到任何单词。我认为我的常规有问题，因为我使用[]。

有没有人对这个问题有任何暗示。

Answer 1

ICU用户指南：Regular Expressions

正则表达式：(?<= \\[)[^\\]]+(?=\\])

(?<= \\[)后视断言[必须逃脱的 [^\\]]+一个或多个必须转义的字符 (?=\\])前瞻性断言，必须转义

NSString *string = @"Access to the requested resource path is unauthorized: v1/streaming/video/558489e46b66d1023309e1a1 [The access token provided is invalid]";
NSString *regex = @"(?<= \\[)[^\\]]+(?=\\])";
NSRange range = [string rangeOfString:regex options:NSRegularExpressionSearch];
NSLog(@"range: %@", NSStringFromRange(range));
NSLog(@"found: %@", [string substringWithRange:range]);

输出：

范围：{100,36}
found：提供的访问令牌无效

如何使用正则表达式获取子字符串

1 个答案: