For placement of the regex switches, see How do I apply switches like /i or /g to a qr regexp?:

/imsx immediately follow the closing delimiter of the qr, but /gce must be supplied at the point of actual use immediately following m// or s///.

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re^3: Find and extract substring(s) within larger string. by Athanasius
in thread Find and extract substring(s) within larger string. by Anonymous Monk

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