This is the code:

String newtask = "newTask[\\{] taskId\"(?<id>\\d{1,4})\", username\"\\w([_\\w\\d&&^(bahmanBAHMAN)]){6,15}\\d\", isValid\"(?<isitthough>(no|yes))\", name\"[\\w\\s]*\", address\"(?<address>[\\w\\s] [-]\\d{8,10})\", date\"(?<date>\\d{8})\", info\"(?<info>[^\"]*)\", price\"(?<price>\\d \\.{0,1}\\d*)\" "; String changeaddress = "changePlace[\\{] taskId\"(?<idtobechanged>\\d{1,4})\", newAddress\"(?<theaddress>[\\w\\s] [-]\\d{8,10})\" ";
Pattern addingpat = Pattern.compile(newtask);
String command=scanner.nextLine();
Matcher addingmat = addingpat.matcher(command);
if (addingmat.find())
System.out.println("it has matched");

And what the user will type in terminal:

newTask{ taskId"1", username"AyesItsGoood4", isValid"yes", name"reza", address"LeninGrad-12345678", date"19410908", info"do the task", price"1.57" 

It isn't printing anything. I would be really thankful if somone pointed out the problem of this code. Thanks for reading.

CodePudding user response：

The regex needs to be fixed where you tried to use character class subtraction:

newTask[\{] taskId\"(?<id>\d{1,4})\", username\"[a-zA-Z][a-zA-Z&&[^bahmnBAHMN]]{6,15}\d\", isValid\"(?<isitthough>no|yes)\", name\"[\w\s]*\", address\"(?<address>[\w\s] -\d{8,10})\", date\"(?<date>\d{8})\", info\"(?<info>[^\"]*)\", price\"(?<price>\d \.?\d*)\"

See the regex demo.

The \w([_\w\d&&^(bahmanBAHMAN)]){6,15}\d\" is replaced with (?!(?i:bahman\"))\w{7,16}\d\". Here is why:

• \w([_\w\d&&^(bahmanBAHMAN)]){6,15}\d - matches a word char (with \w), then 6-15 occurrences a b, a, h, m, n, B, A, H, M, N char, and then a digit. This happens because what you used is a character class intersection, and the [_\w\d&&^(bahmanBAHMAN)] pattern matches only those chars that are present both in the [_\w\d] and [^(bahmanBAHMAN)] charsets.
• The [a-zA-Z][a-zA-Z&&[^bahmnBAHMN]]{6,15}\d pattern matches a single ASCII letter, then 6 to 15 ASCII letters other than b, a, h, m and n (case insensitive) and then a digit.

In Java:

String newtask = "newTask\\{ taskId\"(?<id>\\d{1,4})\", username\"[a-zA-Z][a-zA-Z&&[^bahmnBAHMN]]{6,15}\\d\", isValid\"(?<isitthough>no|yes)\", name\"[\\w\\s]*\", address\"(?<address>[\\w\\s] -\\d{8,10})\", date\"(?<date>\\d{8})\", info\"(?<info>[^\"]*)\", price\"(?<price>\\d \\.?\\d*)\"";