expr

all

Evaluate expressions and manipulate strings.

Examples (7)

Get the length of a specific string

expr length "string"

Get the substring of a string with a specific length

expr substr "string" from length

Match a specific substring against an anchored pattern

expr match "string" 'pattern'

Get the first char position from a specific set in a string

expr index "string" "chars"

Calculate a specific mathematic expression

expr expression1 +|-|*|/|% expression2

Get the first expression if its value is non-zero and not null otherwise get the second one

expr expression1 \| expression2

Get the first expression if both expressions are non-zero and not null otherwise get zero

expr expression1 \& expression2