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Problem Reqular expression

i write a calculator for android and when i click on the + / -*before the number the program close how i can say that these characters are regular???

17th Dec 2016, 12:33 PM
young boy
young boy - avatar
1 Answer
+ 4
Escape Sequence? Put \ (backslash) before it.
17th Dec 2016, 5:42 PM
Valen.H. ~
Valen.H. ~ - avatar