Grep regex for number of characters pdf#
Just for your info, the second column of the table in pdf might or might not have a comma, in numbers, which is why I am using +.Īny help would be highly appreciated, please. I have spent quite a bit of time on this but I cannot figure out what is wrong with my regex. I'm supposed to get 6 outputs for Weekend, but only getting 4. Here is the input string as a text: 00 - 04 Weekday 25t8 10.083 $26.03 The output I am getting is below: [[array('04 - 08 Weekend', dtype=' In this tutorial, we'll learn how to use regular expressions with. This code should read a string from the console, and match it. Using regex with grep allows for some complex search and return operations in Linux. + for a string of at least 3 chars long where all chars are constrained to be either l, L, M, m, D or d. + for a string of at least one char constrained to be either l, L, M, m, D or d. means the string must have exactly 3 chars. + means a String that must have the first character uppercase alphabet (any uppercase char between A to Z) followed by at least one lowercase alphabet (any lowercase char between a to z) and terminated by a decimal digit. Regexp does not use the | character as an OR operator in within a square bracket character definition constraint. + means at least one character and they must either be a, s, d or f. * means any number of characters but they must be either be a, s, d or f. means one and only one and not less than one char which is either a, s, d or f. The format of the mobile number has to be known beforehand. Regular expressions can be used to extract mobile number from a text. You should be able to Google (or Bing) on tutorials of regexp. Matching mobile number using regex with grep. You can only use Regex on string but you could always convert your char char c = 'd' Ĭonsole.WriteLine( Regex.IsMatch(new String(c,1), pattern, RegexOptions.IgnoreCase)) If I understand you correctly then you can try something like this var s1 = "Ll" Ĭonsole.WriteLine( Regex.IsMatch(s1, pattern, RegexOptions.IgnoreCase) ) Ĭonsole.WriteLine( Regex.IsMatch(s2, pattern, RegexOptions.IgnoreCase) ) Ĭonsole.WriteLine( Regex.IsMatch(s3, pattern, RegexOptions.IgnoreCase) ) By using the grep command, you can customize how the tool searches for a pattern or multiple patterns in this case. The name stands for Global Regular Expression Print. Use + to mean one or more if it can't be empty or * to mean 0 or more if it's allowed to be empty.Įdit: based on the updated information, if you want to allow one of those characters and only one of those then: ^$ Grep is a powerful utility available by default on UNIX-based systems. As a case insensitive match if you can do that or: ^+$īoth of these require the whole string to match a sequence of L, l, M, m, D or d characters.Grep regex for number of characters how to#
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