GNU Info

(nasm.info)Section 4.2

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4.2. String Handling in Macros: `%strlen' and `%substr'
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   It's often useful to be able to handle strings in macros. NASM
supports two simple string handling macro operators from which more
complex operations can be constructed.

Section 4.2.1

String Length: `%strlen'

Section 4.2.2

Sub-strings: `%substr'