Oct 21, 2011 · Writing a simple regex, but I've never been very good at this. What I'm trying to do is check a string (filename) to make sure it only contains a-z, A-Z, 0-9 or the special characters …

[some text] [some number] [some more text] I want to extract the text in [some number] using the Java regex classes. I know roughly what regular expression I want to use (though all …

When you write a regex in the form of a Java String literal, you can use "\n" to pass the regex compiler a linefeed symbol, or "\\n" to pass it the escape sequence for a linefeed.

While substring looks for a specific string or value, regex looks for a format. It's more and more dynamic. You need regex, if you are looking for a pattern instead of a special value.

Can anyone please help me do the following in a java regular expression? I need to read 3 characters from the 5th position from a given String ignoring whatever is found before and …

Dec 8, 2018 · The regex compiles fine, and there are already JUnit tests that show how it works. It's just that I'm a bit confused about why the first question mark and colon are there.

Nov 29, 2010 · Java’s Regex Unicode Problems The problem with Java regexes is that the Perl 1.0 charclass escapes — meaning \w, \b, \s, \d and their complements — are not in Java …

Jan 15, 2014 · It takes your normal regular expression and outputs the Java-compatible string expression. Saved me tons of time converting huge regex strings myself. Note that not all …

In the following code I am trying to get the output to be the different formatting of phone numbers and if it is either valid or not. I figured everything out but the Java Regular Expression code o...

Java - Filtering List Entries by Regex Asked 11 years, 5 months ago Modified 6 years, 11 months ago Viewed 56k times