CGrateS can do inline regex replacement.

This is less of a blog post and more of a brain dump.

Strip + in phone number as an Attribute:

{
    "result": {
        "Tenant": "cgrates.org",
        "ID": "Attribute_International",
        "Contexts": [
            "*any"
        ],
        "FilterIDs": [
            "*string:~*req.csv_11_dst_domain:international.numberportability.local"
        ],
        "ActivationInterval": null,
        "Attributes": [
            {
                "FilterIDs": [],
                "Path": "*req.Category",
                "Type": "*constant",
                "Value": [
                    {
                        "Rules": "call_international"
                    }
                ]
            },
            {
                "FilterIDs": [],
                "Path": "*req.Destination",
                "Type": "*variable",
                "Value": [
                    {
                        "Rules": "~*req.Destination:s/^\\+(\\d+)/$1/"
                    }
                ]
            }
        ],
        "Blocker": false,
        "Weight": 0
    },
    "error": null
}

These examples are from ERS where I’m reading from databases / CSVs / whatever.

This example strips a leading + on a phone number in the Subject field

{"tag": "Subject", "path": "*cgreq.Subject", "type": "*variable", "value":"~*req.src_user:s/^\\+(.*)$/$1/"}

This one replaces nicktest.com with mobile.operatorx.numberportability.local and after that replaces 10.171.2.134 with fixed.operatorx.numberportability.local

{"tag": "src_domain", "path": "*cgreq.src_domain", "type": "*variable", "value": "~*req.src_domain:s/^nicktest.com$/mobile.operatorx.numberportability.local/:s/^10.171.2.134$/fixed.operatorx.numberportability.local/"},

When the regular expressions are joined one after another like this, the output of the first regex is evaluated by the second regex rule, and so on.