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java substring example
Article Introduction：There are two uses of Java substring method: 1. substring(intbeginIndex) intercepts from the specified index to the end; 2. substring(intbeginIndex,intendIndex) intercepts the left-closed and right-open interval [beginIndex,endIndex). It is common in scenarios such as extracting file extensions, intercepting date parts, and processing URLs. When using it, you should pay attention to the index not exceeding the bounds, avoiding null pointer exceptions, and understand the memory optimization of Java7 and later versions, and ensure that the string is not empty and has a sufficient length before calling this method.
2025-07-18
comment 0
360
mysql substring function
Article Introduction：MySQL's SUBSTRING function is used to extract substrings from strings. Its basic syntax is SUBSTRING(str, start, length) or SUBSTRING(strFROMstartFORlength), where str is the original string, start is the starting position (starting from 1), and length is the number of characters to be extracted (optional). 1. If length is omitted when using it, it will be extracted to the end of the string; 2. It is often used to extract specific parts from fields, such as extracting the user ID in the mailbox domain name or path; 3. Pay attention to the index starting from 1, start returning to an empty string beyond the length, and calculate according to characters instead of bytes when processing multi-byte characters; 4.
2025-07-16
comment 0
748
