to extract the content in a specific range of a string with Pattern.compile:
The syntax
Pattern Pattern.compile(String regex, int flag)The two parameters in the Pattern.compile function:
Examples :
//string to intercept
String splitStr = “[user:name] = select name from user”;
// reg
String pattern = "(\\[+)(\\w+)\\:(\\w+)(\\]+)";
//Pattern.compile function
Matcher matcher = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE).matcher(splitStr);
while (matcher.find()) {
//get=> [user:name]
String allcon = matcher.group(0);
//start from [
String tableJoin1 = matcher.group(1);
//get table name=> user
String tableName = matcher.group(2);
//get fieldname=> name
String filed = matcher.group(3);
//end position ]
String tableJoin4 = matcher.group(4);
}The regular expression defined in this program mainly extracts the content in the four brackets, starting with the \\ symbol, followed by the intercepted symbol, and w represents the matched character. According to this rule, the corresponding parameters can be extracted: tableName represents the extracted table name, and filed represents the extracted field name.
I need to extract the content in a specific range of a string. After searching for the information, the Pattern.compile function in Java is used to intercept the specified string. How do i use it properly?
to extract the content in a specific range of a string with Pattern.compile:
The syntax
Pattern Pattern.compile(String regex, int flag)The two parameters in the Pattern.compile function:
Examples :
//string to intercept
String splitStr = “[user:name] = select name from user”;
// reg
String pattern = "(\\[+)(\\w+)\\:(\\w+)(\\]+)";
//Pattern.compile function
Matcher matcher = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE).matcher(splitStr);
while (matcher.find()) {
//get=> [user:name]
String allcon = matcher.group(0);
//start from [
String tableJoin1 = matcher.group(1);
//get table name=> user
String tableName = matcher.group(2);
//get fieldname=> name
String filed = matcher.group(3);
//end position ]
String tableJoin4 = matcher.group(4);
}The regular expression defined in this program mainly extracts the content in the four brackets, starting with the \\ symbol, followed by the intercepted symbol, and w represents the matched character. According to this rule, the corresponding parameters can be extracted: tableName represents the extracted table name, and filed represents the extracted field name.
Pattern.compile function extracts the specified characters in the string?
Pattern.compile function extracts the specified characters in the string?
I need to extract the content in a specific range of a string. After searching for the information, the Pattern.compile function in Java is used to intercept the specified string. How do i use it properly?