Text Column Selection Tool

Features:

• Select by Character:Select by character units, counting one Chinese character as one character, suitable for text processing
• Select by Byte:Select by byte units, with one Chinese character occupying 3 bytes (UTF-8), suitable for fixed-length records
• Flexible Column Range:Supports specifying start column and length, allowing selection of any column range
• Smart Processing:Supports options like trimming spaces, removing empty lines, adding line numbers, etc.
• Convenient Operation:Supports one-click copying of selection results
• Pure front-end processing, data is not uploaded to the server, ensuring privacy and security

Use Cases:

• Log File Processing: Extract specific fields from logs (e.g., timestamp, level, message)
• Fixed-Length Record Processing: Handle fixed-format text files by extracting data based on column positions
• Data Cleaning: Select useful parts from messy text
• Code Processing: Extract specific columns from code (e.g., remove line numbers, extract comments)
• Table Data Extraction: Select specified columns from aligned text tables
• Batch Text Trimming: Uniformly extract specified parts from multiple lines of text

Usage Tips:

• Column numbering starts at 1; column 1 corresponds to the first character/byte
• Leave length empty to select until the end of each line
• If the start column exceeds the line length, the output for that line will be empty (use the "Remove Empty Lines" option to filter)
• Character mode is suitable for mixed Chinese and English text; byte mode is suitable for fixed-byte-width records
• Use the "Add Line Numbers" option to retain original line number information in the output

Example:

Original text:  Hello World! Welcome
Start column=7, length=5 (character mode)
Selection result: World