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In languages without a built-in trim function, it is usually simple to create a custom function which accomplishes the same task.
====APL====
[[APL (programming language)|APL]] can use regular expressions directly:
<syntaxhighlight lang="apl">
Trim←'^ +| +$'⎕R''
</syntaxhighlight>
Alternatively, a functional approach combining Boolean masks that filter away leading and trailing spaces:
<syntaxhighlight lang="apl">
Trim←{⍵/⍨(∨\∧∘⌽∨\∘⌽)' '≠⍵}
</syntaxhighlight>
Or reverse and remove leading spaces, twice:
<syntaxhighlight lang="apl">
Trim←{(∨\' '≠⍵)/⍵}∘⌽⍣2
</syntaxhighlight>
====AWK====
In [[AWK]], one can use regular expressions to trim:
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