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The substr method extracts parts of a string, beginning at the character at the specified position, and returns the specified characters.
Tip: To extract characters from the end of the string, use a negative start number.
Required What to substring.
Required The position where to start the extraction. First character is at index 0.
- If
startis positive and greater than, or equal, to the length of the string,substr()returns an empty string. - If
startis negative,substr()uses it as a character index from the end of the string. - If
startis negative or larger than the length of the string,startis set to 0.
The number of characters to extract. If omitted, it extracts the rest of the string.
A new String, containing the extracted part of the text. If length is 0 or negative, an empty string is returned.
uses: web3j/[email protected]
with:
value: 'Mona the Octocat'
start: '9'Result: Octocat