nt single line</span>
hl com | <span class="hl com">Comment block</span>
hl str | <span class="hl str">String</span>
hl esc | <span class="hl esc">Escape sequence</span>
hl ipl | <span class="hl ipl">Interpolation</span>
hl ppc | <span class="hl ppc">Preprocessor directives</span>
hl pps | <span class="hl pps">Strings within preprocessor directives</span>
hl lin | <span class="hl lin">Line numbers</span>
hl num | <span class="hl num">Numerica constants</span>
hl opt | <span class="hl opt">Operators</span>
h