I was brushing up on my regular expressions in java when I did a simple test But in JavaScript What is going on here? And can I make my java regex pattern “q” behave the same as JavaScript? Answer In JavaScript match returns substrings which matches used regex. In Java matches checks if entire str…
Tag: regex
String pattern which starts with # @ and can contain underscore and minus
I try to make a string pattern that can contain UTF-8 characters (öäå, etc) and match the following criteria in Java (1.7); Must start with # or @ Must be lower-case Can contain – or _ (minus and …
regex certain character can exist or not but nothing after that
I’m new to regex and I’m trying to do a search on a couple of string. I wanted to check if a certain character, in this case its “:” (without the quote) exist on the strings. If : does not exist in the string it would still match, but if : exist there should be nothing after that only …
Delete anything between “<” and “>” in a String
I have try restString = restString.replaceAll(“\<.*\>”, “”); and restString = restString.replaceAll(“\<[^(\>)]*\>”, “”);. Both seems don’t work. I don’t know if I could represent the meaning in the regular expression…
Check and extract a number from a String in Java
I’m writing a program where the user enters a String in the following format: I need to check that there is a number in the String and then extract just the number. If i use .contains(“\d+”) or .contains(“[0-9]+”), the program can’t find a number in the String, no matter wh…
Set two flags in Java regex.Pattern
I need a matcher like this: and the problem is that it is not simple ASCII. I know that in this particular case I could use [u00FCu00DC] for the ü, but I need to be a bit more general (building the regex from other matcher groups). So according to javadocs: By default, case-insensitive matching assumes that o…
Java regex capturing groups indexes
I have the following line, I need to fetch the word ABC, I wrote the following code snippet, So if I put group(0) I get ABC: but if I put group(1) it is ABC, so I want to know What does this 0 and 1 mean? It will be better if anyone can explain me with good examples. The regex
Regex to extract valid Http or Https
I’m currently having some issues with a regex to extract a URL. I want my regex to take URLS such as: Through some tutorials, I’ve learned that this regex will find all the above: ^(http|https)://.*$ however, it will also take http://local:1000;http://invalid http://khttp://as a single string when…
How do I check if a string contains a list of characters?
How do I check if a list of characters are in a String, for example “ABCDEFGH” how do I check if any one of those is in a string. Answer use regular expression in java to check using str.matches(regex_here) regex in java for example:
Java Regular Expression split keeping contractions
When using split(), what regular expression would allow me to keep all word characters but would also preserve contractions like don’t won’t. Anything with word characters on both sides of the apostrophe but removes any leading or trailing apostraphes such as ’tis or dogs’. I have: but…