Invalid pattern sequence in regex

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I have this code:

Java

Pattern.compile("^[SFTG]\d{7}[A-Z]$");

And I get this error:

Invalid escape sequence in ^[SFTG]\d{7}[A-Z]$

How can I solve this error?

Posted 17-Nov-14 4:32am

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Updated 12-Dec-14 4:13am

Thomas Daniels

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Maciej Los · Answer 1 · 2014-11-17T04:35:00

Solution 1

See this: Escape special characters[^]

Posted 17-Nov-14 4:35am

Maciej Los

Manfred Rudolf Bihy · Answer 2 · 2014-11-17T05:14:00

Solution 2

The string containing you regular expression has a backslash in it:

Pattern .compile("^[SFTG]\d{7}[A-Z]$");

It should look like this instead:

Pattern .compile("^[SFTG]\\d{7}[A-Z]$");
//                       ^^-------------- Double backslash needed here because backslash is an escape character in strings.

See also here: https://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.10.6[^]

Regards,

Manfred

Posted 17-Nov-14 5:14am

Manfred Rudolf Bihy

Comments

Maciej Los 17-Nov-14 13:41pm

And what does your answer differs from mine, Manfred?

Manfred Rudolf Bihy 17-Nov-14 15:22pm

I didn't read your solution, sorry!

Maciej Los 17-Nov-14 16:00pm

Not to worry ;)
+5! for direct instructions...