[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 …

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 …

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.

@Lupos \s is regex for “whitespace”. To code a literal backslash in Java, you must escape the backslash with another backslash, so to code \s in the regex, you must code "\\s" in your …

Oct 4, 2010 · To make the regex engine interpret them as normal regex characters period (.) and dollar-sign ($), you need to prefix a single backslash to each. The single backslash ( itself a …

May 12, 2015 · The backslash is doubled in program code because it is Java's syntax for string literals. Java compiler makes one backslash out of it, and the string with one slash is passed …

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

May 27, 2017 · Careful, if you think the presence of \\s in the regex means that this will reduce sequences of one or more whitespace characters to a single space. It won't always do that. …

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 …

May 2, 2013 · Of course that in Java you'd need a double backslash instead of the regular backslash, so the Java string that matches the above regex is ^-?\\d+$ NOTE: The ^$ (string …