digitBoundary - Match boundary between digit characters and non-digit characters - MATLAB (original) (raw)

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Match boundary between digit characters and non-digit characters

Since R2020b

Syntax

Description

[pat](#mw%5F6cf1bd31-43f9-4425-939f-03976f2de8c6%5Fsep%5Fmw%5F5d8462f7-c5cb-4493-9ed2-15c426e9be6f) = digitBoundary creates a pattern that matches the start or end of a run of digit characters. digitBoundary can be negated using the ~ operator. When negated,~digitBoundary matches the boundary between any two characters except at the start or end of a run of digits.

example

[pat](#mw%5F6cf1bd31-43f9-4425-939f-03976f2de8c6%5Fsep%5Fmw%5F5d8462f7-c5cb-4493-9ed2-15c426e9be6f) = digitBoundary([type](#mw%5F6cf1bd31-43f9-4425-939f-03976f2de8c6%5Fsep%5Fmw%5F3db4ca55-65f2-47cb-817d-7df607c4d0ee)) specifies whether to match at the start or end of a run of digits. type can be 'start', 'end', or 'either' (default).

example

Examples

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Use digitBoundary to divide a string along boundaries between digits and nondigit characters.

Create a pattern that matches any digit boundaries.

txt = "123 abc .?! def 456"; pat = digitBoundary;

Use replace to insert "|" characters at the matched boundaries.

ans = "|123| abc .?! def |456|"

Use the "start" and "end" options for digitBoundary to match the boundary between digits and nondigit characters.

Create a string that contains several different character types. Create a pattern that matches any characters between the "start" boundary for digits and an "end" boundary.

txt = "123 abc .?! def 456"; pat = digitBoundary("start") + wildcardPattern(1,inf) + digitBoundary("end");

Extract the pattern.

boundaries = extract(txt,pat)

boundaries = 2×1 string "123" "456"

Use the ~ operator to negate digitBoundary. This matches the boundary between two characters when both are digit characters or neither is a digit character.

Create a string that contains several different character types. Create a pattern that matches a negated digitBoundary.

txt = "123 abc .?!"; pat = ~digitBoundary;

Use replace to insert "|" characters to show where ~digitBoundary matches.

boundaries = replace(txt,pat,"|")

boundaries = "1|2|3 |a|b|c| |.|?|!|"

Input Arguments

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Boundary type, specified as 'start', 'end', or 'either'.

Data Types: char | string

Extended Capabilities

Version History

Introduced in R2020b