Results for “read text”
Small, practical examples. Search by task or narrow things down below.
Check a literal prefix in C++17
C++: Use string compare because starts_with was introduced after C++17.
C++✓ Tested
Check a literal suffix in C++17
C++: Check lengths before subtracting to avoid an unsigned underflow.
C++✓ Tested
Extract a substring with an explicit count
C++: The second substr argument is a length rather than an ending index.
C++✓ Tested
Inspect a substring without allocating a copy
C++: A string_view refers to existing storage and must not outlive that storage.
C++✓ Tested
Iterate over all regular-expression matches
C++: A regex iterator yields successive matches without manually updating an offset.
C++✓ Tested
Split a line into named fields
Read a simple delimiter-separated line into variables.
read✓ Tested
Trim surrounding ASCII whitespace
C++: Find the first and last non-whitespace bytes before taking a substring.
C++✓ Tested
Validate a complete identifier
C++: regex_match requires the pattern to match the complete input sequence.
C++✓ Tested
Compare a row with the previous row
Read a preceding value with LAG.
LAG✓ Tested
Extract a JSON field
Read a scalar value from JSON text.
json_extract✓ Tested
Show the first lines of a file
Read only the first three lines of a text file, useful for checking a header or previewing a large log.
head✓ Tested
Accept several lines of text
HTML: Learn how to accept several lines of text in a complete browser example.
HTML✓ Tested