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[[File:The trigger operator - slide 3.jpg|thumb|path satisfying ''r triggers p'' in two overlapping ways]]
[[File:The trigger operator - slide 4.jpg|thumb|path satisfying ''r triggers p' in three ways]]
The regular expressions of PSL have the common operators for concatenation ({{color|red|;}}), Kleene-closure ({{color|red|*}}), and union ({{color|red|{{code|{{!}}}}}}), as well as operator for fusion ({{color|red|:}}), intersection ({{color|red|&&}}) and a weaker version ({{color|red|&}}), and many variations for counting {{color|red|[*n]}}, {{color|red|[->n]}}, {{color|red|[=n]}}.
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