Java Matcher模式中的正则表达式

Question

I would like to ask the java regular expression in Matcher & Pattern

my code is

Pattern TR = Pattern.compile("\\\\[\+"\\\\]T\\\\[MR\\\\]");

I'm looking for the rgx for

+TR
"TR
+TM
"TM

There is something wrong on my regular expression. Could someone please point out ? Thank you so much

Answer 1

Just the below would be enough for your case.

Pattern TR = Pattern.compile("[+\"]T[MR]");

DEMO

[+\\"] - Character class which matches double quotes or + symbol.

[MR] - Matches M or R character.

\\" - Matches the literal double quotes.

Example:

String[] s = {"+TR","\"TR","+TM","\"TM"};
for (String i:s)
{
 System.out.println(i.matches("[+\"]T[MR]"));
}

Output:

true
true
true
true