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String Find

Return index of first occurrence of pattern string

  • Library:
  • Simulink / String


The String Find block returns the index of the first occurrence of the pattern string sub in the text string str.



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String in which to find pattern (sub), specified as a scalar.

Data Types: string

Pattern to be found in string (str), specified as a scalar.

Data Types: string


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Position index of the found pattern, specified as a positive integer scalar.

  • If the block does not find the pattern, it returns -1.

  • If the sub parameter is empty (""), the block returns 1, indicating that it matched the beginning of the searched string.

Data Types: int32

Block Characteristics

Data Types

integer | string

Direct Feedthrough


Multidimensional Signals


Variable-Size Signals


Zero-Crossing Detection


Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Introduced in R2018a