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regex - Why does a*a match aaa? - Stack Overflow It does initially attempt to match the entire string, but repetition will backtrack if a match fails After the a* initially matching the entire string, the regex tries to match the next token, the single a This fails, so then the a* backtracks back a character (so that it only matches aa rather than aaa) This time, the last token, the single a, is fulfilled, so a match is found Greedyness
How does the regular expression (aa)+\1 match aaaaaa? The \1 refers to the captured group, which is the same thing the quantifier is referring to So effectively, it's saying "group aa, 1 or more times, and then one more time" Which is the same as "2 or more times" So the regex might be clearer as this: (aa){2,} Since aaaaaa is three sets of the aa group, the regex matches the string
American - Airline Pilot Central Forums American### It is against the APC Forum Rules to advocate any labor action which is not authorized by the RLA NMB This applies to ANY wildcat actions, including slowdown, work-to-rules, withdrawal of enthusiasm (WOE), sickouts, etc It is irrelevant whether the union itself has anything to do with the action Major unions have lost court cases and in one instance suffered severe financial
php - Sending arabic characters in URL - Stack Overflow If the file is encoded in UTF-8 then the encoding part is done correctly However, you need to convert the encoding of the incoming string to UTF-8 when you read the parameter Use iconv or mb_convert_encoding for this Also, rawurlencode should be used "by default" instead of urlencode unless there is specific reason not to do it
Regex for AA AA AAAA - Stack Overflow I am really rubbish at regex, could any one help me write to validate the the following format: AA AA AAAA A = any letter lowercase or uppercase = must have a slash must have the following len
Why can a*a+ and (a {2,3})*a {2,3} match aaaa while (a {2,3 . . . A simple workaround for your question is to match aaaa with regex ^(a{2,3})*$ Your problem is that: In the case of (a{2,3})*, regex doesn't seem to consume as much character as possible I suggest not to think in giving back characters Instead, the key is acceptance Once regex accept your string, the matching will be over The pattern a{2,3} only matches aa or aaa So in the case of