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Replace std::regex by std::string functions (fixes issue #3830)

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On Windows with UCRT and a UTF-8 locale std::regex takes a lot of time
(several minutes!). Replacing it avoids that bottleneck.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Stefan Weil 2022-05-29 10:21:42 +02:00
parent f36c0d019b
commit 64bcdce607
1 changed files with 3 additions and 6 deletions
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9
src/ccmain/tessedit.cpp
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@ -23,8 +23,6 @@
# include "config_auto.h"
#endif
#include <regex> // for std::regex_match
#include "control.h"
#include "matchdefs.h"
#include "pageres.h"
@ -248,12 +246,11 @@ void Tesseract::ParseLanguageString(const std::string &lang_str, std::vector<std
std::string remains(lang_str);
// Look whether the model file uses a prefix which must be applied to
// included model files as well.
std::regex e("(.*)/[^/]*");
std::cmatch cm;
std::string prefix;
if (std::regex_match(lang.c_str(), cm, e, std::regex_constants::match_default)) {
size_t found = lang.find_last_of('/');
if (found != std::string::npos) {
// A prefix was found.
prefix = cm[1].str() + "/";
prefix = lang.substr(0, found + 1);
}
while (!remains.empty()) {
// Find the start of the lang code and which vector to add to.