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glibmm 2.82.0
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MatchInfo - MatchInfo is used to retrieve information about the regular expression match which created it. More...
#include <glibmm/regex.h>
Public Member Functions | |
| MatchInfo () | |
| Default constructor. | |
| MatchInfo (GMatchInfo *castitem, bool take_ownership=true) | |
| C object constructor. | |
| MatchInfo (const MatchInfo &other)=delete | |
| MatchInfo & | operator= (const MatchInfo &other)=delete |
| MatchInfo (MatchInfo &&other) noexcept | |
| MatchInfo & | operator= (MatchInfo &&other) noexcept |
| virtual | ~MatchInfo () |
| Destructor. | |
| GMatchInfo * | gobj () |
| Provides access to the underlying C object. | |
| const GMatchInfo * | gobj () const |
| Provides access to the underlying C object. | |
| Glib::RefPtr< Regex > | get_regex () |
| Returns Regex object used in match_info. | |
| Glib::RefPtr< const Regex > | get_regex () const |
| Returns Regex object used in match_info. | |
| Glib::ustring | get_string () const |
| Returns the string searched with match_info. | |
| bool | matches () const |
| Returns whether the previous match operation succeeded. | |
| bool | next () |
| Scans for the next match using the same parameters of the previous call to g_regex_match_full() or g_regex_match() that returned match_info. | |
| int | get_match_count () const |
| Retrieves the number of matched substrings (including substring 0, that is the whole matched text), so 1 is returned if the pattern has no substrings in it and 0 is returned if the match failed. | |
| bool | is_partial_match () const |
Usually if the string passed to g_regex_match*() matches as far as it goes, but is too short to match the entire pattern, false is returned. | |
| Glib::ustring | expand_references (Glib::UStringView string_to_expand) |
| Returns a new string containing the text in string_to_expand with references and escape sequences expanded. | |
| Glib::ustring | fetch (int match_num) |
| Retrieves the text matching the match_num'th capturing parentheses. | |
| bool | fetch_pos (int match_num, int &start_pos, int &end_pos) |
| Retrieves the position in bytes of the match_num'th capturing parentheses. | |
| Glib::ustring | fetch_named (Glib::UStringView name) |
| Retrieves the text matching the capturing parentheses named name. | |
| bool | fetch_named_pos (Glib::UStringView name, int &start_pos, int &end_pos) |
| Retrieves the position in bytes of the capturing parentheses named name. | |
| std::vector< Glib::ustring > | fetch_all () |
| Bundles up pointers to each of the matching substrings from a match and stores them in an array of gchar pointers. | |
Protected Member Functions | |
| void | set_gobject (GMatchInfo *castitem, bool take_ownership=true) |
Protected Attributes | |
| GMatchInfo * | gobject_ |
| bool | take_ownership_ |
MatchInfo - MatchInfo is used to retrieve information about the regular expression match which created it.
| Glib::MatchInfo::MatchInfo | ( | ) |
Default constructor.
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explicit |
C object constructor.
| castitem | The C object. |
| take_ownership | Whether to destroy the C object with the wrapper or not. |
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noexcept |
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virtual |
Destructor.
| Glib::ustring Glib::MatchInfo::expand_references | ( | Glib::UStringView | string_to_expand | ) |
Returns a new string containing the text in string_to_expand with references and escape sequences expanded.
References refer to the last match done with string against regex and have the same syntax used by g_regex_replace().
The string_to_expand must be UTF-8 encoded even if Glib::Regex::CompileFlags::RAW was passed to g_regex_new().
The backreferences are extracted from the string passed to the match function, so you cannot call this function after freeing the string.
match_info may be nullptr in which case string_to_expand must not contain references. For instance "foo\\n" does not refer to an actual pattern and '\n' merely will be replaced with \n character, while to expand "\\0" (whole match) one needs the result of a match. Use g_regex_check_replacement() to find out whether string_to_expand contains references.
| string_to_expand | The string to expand. |
nullptr if an error occurred.| Glib::RegexError |
| Glib::ustring Glib::MatchInfo::fetch | ( | int | match_num | ) |
Retrieves the text matching the match_num'th capturing parentheses.
0 is the full text of the match, 1 is the first paren set, 2 the second, and so on.
If match_num is a valid sub pattern but it didn't match anything (e.g. sub pattern 1, matching "b" against "(a)?b") then an empty string is returned.
If the match was obtained using the DFA algorithm, that is using g_regex_match_all() or g_regex_match_all_full(), the retrieved string is not that of a set of parentheses but that of a matched substring. Substrings are matched in reverse order of length, so 0 is the longest match.
The string is fetched from the string passed to the match function, so you cannot call this function after freeing the string.
| match_num | Number of the sub expression. |
nullptr if an error occurred. You have to free the string yourself. | std::vector< Glib::ustring > Glib::MatchInfo::fetch_all | ( | ) |
Bundles up pointers to each of the matching substrings from a match and stores them in an array of gchar pointers.
The first element in the returned array is the match number 0, i.e. the entire matched text.
If a sub pattern didn't match anything (e.g. sub pattern 1, matching "b" against "(a)?b") then an empty string is inserted.
If the last match was obtained using the DFA algorithm, that is using g_regex_match_all() or g_regex_match_all_full(), the retrieved strings are not that matched by sets of parentheses but that of the matched substring. Substrings are matched in reverse order of length, so the first one is the longest match.
The strings are fetched from the string passed to the match function, so you cannot call this function after freeing the string.
nullptr-terminated array of gchar * pointers. If the previous match failed nullptr is returned. | Glib::ustring Glib::MatchInfo::fetch_named | ( | Glib::UStringView | name | ) |
Retrieves the text matching the capturing parentheses named name.
If name is a valid sub pattern name but it didn't match anything (e.g. sub pattern "X", matching "b" against "(?P<X>a)?b") then an empty string is returned.
The string is fetched from the string passed to the match function, so you cannot call this function after freeing the string.
| name | Name of the subexpression. |
nullptr if an error occurred. You have to free the string yourself. | bool Glib::MatchInfo::fetch_named_pos | ( | Glib::UStringView | name, |
| int & | start_pos, | ||
| int & | end_pos | ||
| ) |
Retrieves the position in bytes of the capturing parentheses named name.
If name is a valid sub pattern name but it didn't match anything (e.g. sub pattern "X", matching "b" against "(?P<X>a)?b") then start_pos and end_pos are set to -1 and true is returned.
| name | Name of the subexpression. |
| start_pos | Pointer to location where to store the start position, or nullptr. |
| end_pos | Pointer to location where to store the end position, or nullptr. |
true if the position was fetched, false otherwise. If the position cannot be fetched, start_pos and end_pos are left unchanged. Retrieves the position in bytes of the match_num'th capturing parentheses.
0 is the full text of the match, 1 is the first paren set, 2 the second, and so on.
If match_num is a valid sub pattern but it didn't match anything (e.g. sub pattern 1, matching "b" against "(a)?b") then start_pos and end_pos are set to -1 and true is returned.
If the match was obtained using the DFA algorithm, that is using g_regex_match_all() or g_regex_match_all_full(), the retrieved position is not that of a set of parentheses but that of a matched substring. Substrings are matched in reverse order of length, so 0 is the longest match.
| match_num | Number of the sub expression. |
| start_pos | Pointer to location where to store the start position, or nullptr. |
| end_pos | Pointer to location where to store the end position, or nullptr. |
true if the position was fetched, false otherwise. If the position cannot be fetched, start_pos and end_pos are left unchanged. | int Glib::MatchInfo::get_match_count | ( | ) | const |
Retrieves the number of matched substrings (including substring 0, that is the whole matched text), so 1 is returned if the pattern has no substrings in it and 0 is returned if the match failed.
If the last match was obtained using the DFA algorithm, that is using g_regex_match_all() or g_regex_match_all_full(), the retrieved count is not that of the number of capturing parentheses but that of the number of matched substrings.
| Glib::RefPtr< Regex > Glib::MatchInfo::get_regex | ( | ) |
Returns Regex object used in match_info.
It belongs to Glib and must not be freed. Use g_regex_ref() if you need to keep it after you free match_info object.
| Glib::RefPtr< const Regex > Glib::MatchInfo::get_regex | ( | ) | const |
Returns Regex object used in match_info.
It belongs to Glib and must not be freed. Use g_regex_ref() if you need to keep it after you free match_info object.
| Glib::ustring Glib::MatchInfo::get_string | ( | ) | const |
Returns the string searched with match_info.
This is the string passed to g_regex_match() or g_regex_replace() so you may not free it before calling this function.
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inline |
Provides access to the underlying C object.
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inline |
Provides access to the underlying C object.
| bool Glib::MatchInfo::is_partial_match | ( | ) | const |
Usually if the string passed to g_regex_match*() matches as far as it goes, but is too short to match the entire pattern, false is returned.
There are circumstances where it might be helpful to distinguish this case from other cases in which there is no match.
Consider, for example, an application where a human is required to type in data for a field with specific formatting requirements. An example might be a date in the form ddmmmyy, defined by the pattern "^\\d?\\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\\d\\d$". If the application sees the user’s keystrokes one by one, and can check that what has been typed so far is potentially valid, it is able to raise an error as soon as a mistake is made.
GRegex supports the concept of partial matching by means of the Glib::Regex::MatchFlags::PARTIAL_SOFT and Glib::Regex::MatchFlags::PARTIAL_HARD flags. When they are used, the return code for g_regex_match() or g_regex_match_full() is, as usual, true for a complete match, false otherwise. But, when these functions return false, you can check if the match was partial calling g_match_info_is_partial_match().
The difference between Glib::Regex::MatchFlags::PARTIAL_SOFT and Glib::Regex::MatchFlags::PARTIAL_HARD is that when a partial match is encountered with Glib::Regex::MatchFlags::PARTIAL_SOFT, matching continues to search for a possible complete match, while with Glib::Regex::MatchFlags::PARTIAL_HARD matching stops at the partial match. When both Glib::Regex::MatchFlags::PARTIAL_SOFT and Glib::Regex::MatchFlags::PARTIAL_HARD are set, the latter takes precedence.
There were formerly some restrictions on the pattern for partial matching. The restrictions no longer apply.
See pcrepartial(3) for more information on partial matching.
true if the match was partial, false otherwise. | bool Glib::MatchInfo::matches | ( | ) | const |
Returns whether the previous match operation succeeded.
true if the previous match operation succeeded, false otherwise. | bool Glib::MatchInfo::next | ( | ) |
Scans for the next match using the same parameters of the previous call to g_regex_match_full() or g_regex_match() that returned match_info.
The match is done on the string passed to the match function, so you cannot free it before calling this function.
true is the string matched, false otherwise.| Glib::RegexError |
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1.9.8