384 support performance extraction with regex

[JavierCladellas]

• closes Support performance extraction with regex #384

New:

• Support extracting performance variables using regex
• Support extracting from standard output ! (works for any supported format)

To use stoud : just put

"filepath":"stdout"

For regex; multiple tag capturing is supported, mostly the same as the standard re python library. Variables are extracted line by line.

• Named capture groups

{
    "pattern": "^(?P<name>[^:\\n]+):\\s*(?P<value>[-+]?[\\d.]+(?:[eE][-+]?\\d+)?)$",
    "variable_name_group":"name",
    "variable_value_group":"value"
}

• Just named value capture group (column names will be match_0, match_1, ...

{
    "pattern": "^([^:\\n]+):\\s*(?P<value>[-+]?[\\d.]+(?:[eE][-+]?\\d+)?)$",
    "variable_value_group":"value"
}

• numbered capture groups (0 refers to the whole line)

{
    "pattern": "^([^:\\n]+):\\s*([-+]?[\\d.]+(?:[eE][-+]?\\d+)?)$",
    "variable_name_group":1,
    "variable_value_group":2
}

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