EAMxx: regex limitations in io

[mahf708]

regex like ([A-Za-z0-9_]+) don't capture a field named like "p_mid_where_p_mid_ge_0.9" (the issue is the decimal point)

solutions:

• everywhere possible expand ([A-Za-z0-9_]+) to include dots (and other things?)
• forbid patterns like p_mid_where_p_mid_ge_0.9 (e.g., EAMxx: conditional sampling diagnostics #7508)

[bartgol]

I'd say we add the dot to the regex.