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Internal`StringToDoubleInternal`StringToDouble seems applicable:

Internal`StringToDouble /@ {"F2.5", "2.5F"}
{2.5, 2.5}

The evaluated form of Quantity["2.3s"] is Quantity[2.3`,"Seconds"] therefore as already commented:

Quantity["2.3s"][[1]]
2.3

System`Convert`TableDump`ParseTableSystem`Convert`TableDump`ParseTable provides configurable options for processing strings.

Internal`StringToDouble seems applicable:

Internal`StringToDouble /@ {"F2.5", "2.5F"}
{2.5, 2.5}

The evaluated form of Quantity["2.3s"] is Quantity[2.3`,"Seconds"] therefore as already commented:

Quantity["2.3s"][[1]]
2.3

System`Convert`TableDump`ParseTable provides configurable options for processing strings.

Internal`StringToDouble seems applicable:

Internal`StringToDouble /@ {"F2.5", "2.5F"}
{2.5, 2.5}

The evaluated form of Quantity["2.3s"] is Quantity[2.3`,"Seconds"] therefore as already commented:

Quantity["2.3s"][[1]]
2.3

System`Convert`TableDump`ParseTable provides configurable options for processing strings.

1
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Internal`StringToDouble seems applicable:

Internal`StringToDouble /@ {"F2.5", "2.5F"}
{2.5, 2.5}

The evaluated form of Quantity["2.3s"] is Quantity[2.3`,"Seconds"] therefore as already commented:

Quantity["2.3s"][[1]]
2.3

System`Convert`TableDump`ParseTable provides configurable options for processing strings.