std::regex_replace
STD::regex[医]取代
Defined in header | | |
---|---|---|
template< class OutputIt, class BidirIt, class Traits, class CharT, class STraits, class SAlloc > OutputIt regex_replace( OutputIt out, BidirIt first, BidirIt last, const std::basic_regex<CharT,Traits>& re, const std::basic_string<CharT,STraits,SAlloc>& fmt, std::regex_constants::match_flag_type flags = std::regex_constants::match_default | (1) | (since C++11) |
template< class OutputIt, class BidirIt, class Traits, class CharT > OutputIt regex_replace( OutputIt out, BidirIt first, BidirIt last, const std::basic_regex<CharT,Traits>& re, const CharT* fmt, std::regex_constants::match_flag_type flags = std::regex_constants::match_default | (2) | (since C++11) |
template< class Traits, class CharT, class STraits, class SAlloc, class FTraits, class FAlloc > std::basic_string<CharT,STraits,SAlloc> regex_replace( const std::basic_string<CharT,STraits,SAlloc>& s, const std::basic_regex<CharT,Traits>& re, const std::basic_string<CharT,FTraits,FAlloc>& fmt, std::regex_constants::match_flag_type flags = std::regex_constants::match_default | (3) | (since C++11) |
template< class Traits, class CharT, class STraits, class SAlloc > std::basic_string<CharT,STraits,SAlloc> regex_replace( const std::basic_string<CharT,STraits,SAlloc>& s, const std::basic_regex<CharT,Traits>& re, const CharT* fmt, std::regex_constants::match_flag_type flags = std::regex_constants::match_default | (4) | (since C++11) |
template< class Traits, class CharT, class STraits, class SAlloc > std::basic_string<CharT> regex_replace( const CharT* s, const std::basic_regex<CharT,Traits>& re, const std::basic_string<CharT,STraits,SAlloc>& fmt, std::regex_constants::match_flag_type flags = std::regex_constants::match_default | (5) | (since C++11) |
template< class Traits, class CharT > std::basic_string<CharT> regex_replace( const CharT* s, const std::basic_regex<CharT,Traits>& re, const CharT* fmt, std::regex_constants::match_flag_type flags = std::regex_constants::match_default | (6) | (since C++11) |
regex_replace
使用正则表达式对字符序列执行替换:
1%个拷贝范围内的29个字符[first,last)
到out
,替换任何匹配的序列。re
格式化的字符fmt
.换言之:
- 构造一个std::regex_iterator对象i好像std::regex_iterator<BidirIt, CharT, traits> i(first, last, re, flags),并使用它来逐步完成每一场比赛。re在序列内[first,last)...
- 每一场比赛
m
,复制不匹配的子序列%28。m.prefix()
29%out
好像out =
std::copy
(m.prefix().first, m.prefix().second, out)
然后用格式化的替换字符串替换匹配的子序列,就好像通过调用out = m.format(out, fmt, flags)
...
- 当没有找到匹配的字符时,将剩余的不匹配字符复制到
out
好像out =
std::copy
(last_m.suffix().first, last_m.suffix().second, out)
何地last_m
是最后找到的匹配的副本。
- 如果没有匹配,则将整个序列复制到
out
就像现在一样out =
std::copy
(first, last, out)
- 如果
flags
含std::regex_constants::format_no_copy
,则不将不匹配的子序列复制到out
...
- 如果
flags
含std::regex_constants::format_first_only
,只有第一次匹配被替换。
2%29与1%29相同,但格式化的替换是通过调用out = m.format(out, fmt, fmt + char_traits<charT>::length(fmt), flags)
3-4%29构造空字符串。result类型std::basic_string<CharT, ST, SA>和电话std::regex_replace(std::back_inserter(result), s.begin(), s.end(), re, fmt, flags)...
5-6%29构造空字符串。result类型std::basic_string<CharT>和电话std::regex_replace(std::back_inserter(result), s, s +std::char_traits<CharT>::length(s), re, fmt, flags)...
参数
first, last | - | the input character sequence, represented as a pair of iterators |
---|---|---|
s | - | the input character sequence, represented as std::basic_string or character array |
re | - | the std::basic_regex that will be matched against the input sequence |
flags | - | the match flags of type std::regex_constants::match_flag_type |
fmt | - | the regex replacement format string, exact syntax depends on the value of flags |
out | - | output iterator to store the result of the replacement |
类型要求
-输出必须符合输出器的要求。
-Bidirit必须符合双向迭代器的要求。
返回值
1-2%29返回输出迭代器的副本。out
在所有的插入之后。
3-6%29返回字符串。result
其中包含输出。
例外
可抛std::regex_error
表示误差条件...
例
二次
#include <iostream>
#include <iterator>
#include <regex>
#include <string>
int main()
{
std::string text = "Quick brown fox";
std::regex vowel_re("a|e|i|o|u"
// write the results to an output iterator
std::regex_replace(std::ostreambuf_iterator<char>(std::cout),
text.begin(), text.end(), vowel_re, "*"
// construct a string holding the results
std::cout << '\n' << std::regex_replace(text, vowel_re, "[$&]") << '\n';
}
二次
产出:
二次
Q**ck br*wn f*x
Q[u][i]ck br[o]wn f[o]x
二次
另见
regex_search (C++11) | attempts to match a regular expression to any part of a character sequence (function template) |
---|---|
match_flag_type (C++11) | options specific to matching (typedef) |
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