Programming-Idioms

History of Idiom 137 > diff from v4 to v5

Edit summary for version 5 by programming-idioms.org:
[Java] Kerning

↷

Version 4

2016-06-10, 21:46:01

Version 5

2016-06-10, 21:46:29

Idiom #137 Check if string contains only digits

Set boolean b to true if string s contains only characters in range '0'..'9', false otherwise.

Idiom #137 Check if string contains only digits

Set boolean b to true if string s contains only characters in range '0'..'9', false otherwise.

Java

Java

Code

boolean b = s.matches("[0-9]*");

Code

boolean b = s.matches("[0-9]*");

Comments bubble

This uses a regular expression .

Comments bubble

This uses a regular expression.

Doc URL

https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#matches-java.lang.String-

Doc URL

https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#matches-java.lang.String-

Origin

http://stackoverflow.com/a/10575676/871134

Origin

http://stackoverflow.com/a/10575676/871134

Demo URL

https://ideone.com/xtfb5B

Demo URL

https://ideone.com/xtfb5B

↶ Previous change

Next change ↷

History of Idiom 137 > diff from v4 to v5

Version 4

Version 5

Idiom #137 Check if string contains only digits

Idiom #137 Check if string contains only digits

Code

Code

Comments bubble

Comments bubble

Doc URL

Doc URL

Origin

Origin

Demo URL

Demo URL

Please choose a nickname before doing this