Match String (Flowgraph Node)

Overview

• Node Name: Match String
• Category: simple
• File: extensions/flowgraph/nodes/string/match.lua

Matches a string against a Lua pattern and outputs the first match.

Pin Schema

Input Pins

Output Pins

Data Properties

Behavior

• init() - Sets default pattern to "%d".
• work() - Calls string.match(input, pattern) and outputs the result.
• drawMiddle() - Displays the current pattern in the node body.

How It Works

1. Set the pattern data property to a Lua pattern string.
2. Connect an input string to the value pin.
3. The output value pin receives the first match from string.match.

-- Example: pattern = "%d+"
-- Input: "Score: 42 points"
-- Output: "42"

-- Example: pattern = "(%a+)"
-- Input: "hello world"
-- Output: "hello"

Notes

• Uses Lua patterns (not regex). See Lua 5.1 pattern reference for syntax.
• Returns only the first match. For multiple captures, consider custom Lua.

Key Dependencies

• Lua built-in string.match

See Also

• Format String (Flowgraph Node) - Related reference
• Concat (Flowgraph Node) - Related reference
• SubString (Flowgraph Node) - Related reference
• FlowGraph Guide - Guide