How to remove all characters before a specific cha

问题:

I have a string and I'm getting value through a html form so when I get the value it comes in a URL so I want to remove all the characters before the specific charater which is = and I also want to remove this character. I only want to save the value that comes after = because I need to fetch that value from the variable..

EDIT : I need to remove the = too since I'm trying to get the characters/value in string after it...

回答1:

You can use .substring():

String s = "the text=text";
String s1 = s.substring(s.indexOf("=")+1);
s1.trim();

then s1 contains everything after = in the original string.

s1.trim()

.trim() removes spaces before the first character (which isn't a whitespace, such as letters, numbers etc.) of a string (leading spaces) and also removes spaces after the last character (trailing spaces).

回答2:

While there are many answers. Here is a regex example

String test = "eo21jüdjüqw=realString";
test = test.replaceAll(".+=", "");
System.out.println(test);

// prints realString

Explanation:

.+ matches any character (except for line terminators)
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
= matches the character = literally (case sensitive)

This is also a shady copy paste from https://regex101.com/ where you can try regex out.

回答3:

You can split the string from the = and separate in to array and take the second value of the array which you specify as after the = sign For example:

String CurrentString = "Fruit = they taste good"; String[] separated = CurrentString.split("="); separated[0]; // this will contain "Fruit" separated[1]; //this will contain "they teste good"

then separated[1] contains everything after = in the original string.

回答4:

Maybe locate the first occurrence of the character in the URL String. For Example:

String URL = "http://test.net/demo_form.asp?name1=stringTest";

int index = URL.indexOf("=");

Then, split the String based on an index

String Result = URL.substring(index+1); //index+1 to skip =

String Result now contains the value: stringTest