简单的正则表达式问题。我有以下格式的字符串:
Some text with multi line.
[page/]
Another text with multi line.
[page/]
Third text with multi line.
[page/]
提取和
[page/]
之间文本的正则表达式是什么?
我正在使用这段代码,但我只得到了第一个匹配项。
NSString *path = [[NSBundle mainBundle] pathForResource"File" ofType"txt"];
NSString *mainText = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSError *error = NULL;
NSRange range = NSMakeRange(0, mainText.length);
NSString *pattern = [NSString stringWithFormat"(?<=\\)(?s)(.*?)(?=\\[page/])"];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];
NSRange rangeOfFirstMatch = [regex rangeOfFirstMatchInString:mainText options:0 range:range];
if (!NSEqualRanges(rangeOfFirstMatch, NSMakeRange(NSNotFound, 0))) {
NSString *substringForFirstMatch = [mainText substringWithRange:rangeOfFirstMatch];
NSLog(@"sub: %@", substringForFirstMatch);
}
我怎样才能在 NSArray 中找到每个匹配项的文本?
您可以使用 matchesInStringptions:range:
,它将匹配数组作为 NSTextCheckingResults 返回:
NSString *pattern = [NSString stringWithFormat"(?<=\\[page\\])(.*?)(?=\\[page\\/\\])"];
NSUInteger options = NSRegularExpressionCaseInsensitive | NSRegularExpressionDotMatchesLineSeparators;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern optionsptions error:&error];
for (NSTextCheckingResult* result in [regex matchesInString:INPUT_STRING
options:0
range:NSMakeRange(0, [input_string_length])])
{
// further code
}
关于ios - 使用正则表达式提取两个标记之间的文本,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29050504/
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