Unicode Trailing Combining Count Tool

Description

Count literal trailing Unicode Mark code points without decomposing precomposed characters.

Text positions can be measured in UTF-16 code units, Unicode code points, grapheme clusters, or modeled display columns. These coordinates are not interchangeable. Invisible markers and delimiter policies can also affect interpretation even when a string looks unchanged, so the chosen representation needs to stay explicit.

Count literal trailing Unicode Mark code points without decomposing precomposed characters.

When to use this tool

Use Unicode Trailing Combining Count when you need the stated marker, coordinate, delimiter, or normalization operation under an explicit text representation.

How to use the tool and how it works

Enter text. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read trailingMarks. Use the output convention below.

Count consecutive Unicode General_Category Mark characters from the end of text, stopping at the first non-mark code point.^[1]

Input field	Meaning and units	Accepted input
text	Text	Required. Text; maximum UTF-16 length 8192.

Output field	Interpretation	Returned shape
trailingMarks	Trailing Marks	Required. Safe integer.

json

{
  "input": {
    "text": "aé̂"
  },
  "output": {
    "trailingMarks": 2
  }
}

Limitations and assumptions

This uses JavaScript's Unicode property data and is not a count of grapheme clusters or all Grapheme_Extend characters. It neither normalizes text nor checks mark attachment.
The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.

Alternative or Complementary methods

Choose the coordinate system required by the consumer. Use a full parser, renderer, or segmentation method when a local marker or delimiter rule cannot determine the complete text behavior.

References

Calculation and input contract: text/unicode-trailing-combining-count — tool.io

Similar or alternative tools

Markdown Hardbreak Trailing Spaces Count
Count trailing ASCII spaces on a line without CR or LF and set hardBreak when there are at least two.
Text: Combining Mark Leading Position Flag
Check whether the first scalar of a string has Unicode Mark general category using the runtime Unicode property table; not grapheme segmentation or a validity judgment.