[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 …

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.

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.

Aug 16, 2017 · How to use regex with String.matches in java Asked 8 years, 4 months ago Modified 8 years, 4 months ago Viewed 27k times

Jun 16, 2016 · The head-ache-y part of regular expressions in Java is that you need to double escape any literal characters with \\, since you want a literal backslash character to appear in …

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

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 …

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 …

Aug 5, 2013 · I want to write a simple regular expression to check if in given string exist any special character. My regex works but I don't know why it also includes all numbers, so when I …