File: m4.info,  Node: Len,  Next: Index macro,  Up: Text handling

11.1 Calculating length of strings
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The length of a string can be calculated by ‘len’:

 -- Builtin: len(STRING)
     Expands to the length of STRING, as a decimal number.

     The macro ‘len’ is recognized only with parameters.

     len()
     ⇒0
     len(`abcdef')
     ⇒6