我有 currentString 的动态字符串。 例如 currentstring 像:
<html><head><title></title><meta content="width=320.000000, initial-scale=0.47, maximum-scale=1.0, user-scalable=1" name="viewport"></head><body><table width="510" cellpadding="0" cellpadding="0"><tr><td valign="top"><p><a href="http://erhandemirci.blogspot.com/masak-in-baskani-neden-gorevden-alindi-haberi-828402.html"><img src="http://erhandemirci.blogspot.com/images//news/r-farukeliedioglu-300200-828402.jpg" width="72" height="48" style="border: 1px #000000 solid;" hspace="2" align="left"></a>content...........</p> <p> </p> </td></tr></table></body></html>
我想将表标签的宽度从 510 更改为 0。我尝试了以下代码，但它不起作用。
NSString *currentString = @"<html><...width > <table width="" .... > dynamic string";
// Regular expression to find "word characters" enclosed by {...}:
NSRegularExpression *regex;
regex = [NSRegularExpression regularExpressionWithPattern:@"\\table width=\"(\\w+)\\\""
options:0
error:NULL];
NSMutableString *modifiedString = [currentString mutableCopy];
__block int offset = 0;
[regex enumerateMatchesInString:currentString
options:0
range:NSMakeRange(0, [currentString length])
usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
// range = location of the regex capture group "(\\w+)" in currentString:
NSRange range = [result rangeAtIndex:1];
// Adjust location for modifiedString:
range.location += offset;
// Get old word:
NSString *oldWord = [modifiedString substringWithRange:range];
// Compute new word:
// In your case, that would be
// NSString *newWord = [self replaceWord:oldWord];
NSString *newWord =@"0";
// Replace new word in modifiedString:
[modifiedString replaceCharactersInRange:range withString:newWord];
// Update offset:
offset += [newWord length] - [oldWord length];
}
];
NSLog(@"modified%@", modifiedString);
最佳答案
你几乎是对的，只有那个 @"\\table ...应该是 @"\\<table ...
在模式中:
regex = [NSRegularExpression regularExpressionWithPattern:@"\\<table width=\"(\\w+)\\\""
options:0
error:NULL];
这将取代 <table width="NNN"通过 <table width="0"任意 NNN .
注意一般不建议用正则表达式解析HTML。 使用专用的 HTML 解析器可能是更好的方法。
关于ios - 替换 html 字符串中的特定单词，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20729812/