Java-CPP-Pattern

Java

• Pattern class
  • Pattern.compile(exp, tags)构造
  • .split(input, +/-0)
  • .matcher() return Matcher
• Matcher class
  • .matches() 全字符串匹配
  • .lookingAt() 无时间效应 => reset(new Input String)
  • .find(fromIndex = 0)有时间效应, .regin([, ))
  • 当.lookingAt()或.find()之后, 可使用
    • .start(index = 0)
    • .end(index = 0)
    • .group(index = 0)
  • .repalceAll()和repalceFirst()
  • .appendReplacement() => before find()
  • .appendTail() => after find()

CPP

• std::regex class 或 std::wregex class
  • regex(std::string, std::regex::icase/nosubs/awk/grep)构造
  • .assign(nre, tags)
  • =copy assignment
  • .mark_count() => 匹配项/匹配组的个数
  • .flags() => tags集合返回
• std::regex_search(seq, std::regex, mft) function
  • seq => std::string, std::wstring, C style, C L style
  • mft => std::regex_constants::match_flag_type

• std::regex_search(seq, match, std::regex, mft) function

  • match => std::smatch, std::cmatch, std::wsmatch, std::wcmatch
• std::smatch class 或 std::cmatch, std::wsmatch, std::wcmatch class
  • .ready() => 是否关联std::regex
  • .size(), .empty()
  • .prefix() => 到上一个匹配点, 配合std::sregex_itera使用, 不是匹配项
  • .suffix() => 后面所有字符串, 同上
  • .length(n = 0)
  • .position(n = 0)
  • .str(n = 0)
  • .begin(), .end(), operator[] => ssub_match类
• std::ssub_matchclass 或 std::wssub_match, std::c/wc+sub_match class
  • .matched() => 是否关联std::regex
  • .first, .second
  • .length()
  • .str()
  • String operator() => operator ITC
• 以下是极其常用的用法, 对buffer中输入字符串多次匹配点进行迭代
• std::sregex_iterator class 或 std::wsregex_iterator, std::c/wc+regex_iterator class
  • sregex_iterator([, ), std::regex) 构造, 尾后构造
  • oparator*, operator-> => std::smatch
  • operator++, --, operator==, !=

• 正则匹配与替换结合

• regex_replace([, dst], seq, r, fmt = default, mft = default)函数与smatch.format([, dst], fmt, mft)

  • fmt => regex replacement format string

    RegExp.lastMatch
    RegExp['$&']
    RegExp.$1-$9
    RegExp.input ($_)
    RegExp.lastParen ($+)
    RegExp.leftContext ($`)
    RegExp.rightContext ($')   
  

  • 关于mft => 一些匹配过程中的边角料要求

    inline constexpr match_flag_type match_default = 0;
    inline constexpr match_flag_type match_not_bol = /*unspecified*/;
    inline constexpr match_flag_type match_not_eol = /*unspecified*/;
    inline constexpr match_flag_type match_not_bow = /*unspecified*/;
    inline constexpr match_flag_type match_not_eow = /*unspecified*/;
    inline constexpr match_flag_type match_any = /*unspecified*/;
    inline constexpr match_flag_type match_not_null = /*unspecified*/;
    inline constexpr match_flag_type match_continuous = /*unspecified*/;
    inline constexpr match_flag_type match_prev_avail = /*unspecified*/;
    inline constexpr match_flag_type format_default = 0;
    inline constexpr match_flag_type format_sed = /*unspecified*/;
    inline constexpr match_flag_type format_no_copy = /*unspecified*/;
    inline constexpr match_flag_type format_first_only =/*unspecified*/;
    (since C++17)
  

• (写在最后) => {显然: C++更让人着迷, C++更美}