[BUG][typescript-axios] pattern data gets improperly escaped

[n0idea]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue? Check below

• Have you validated the input using an OpenAPI validator (example)? Yes

• What's the version of OpenAPI Generator used? 4.3.1

• Have you search for related issues/PRs? Yes

• What's the actual output vs expected output?

• Example
  {{{pattern}}} is /\\w+([\\.-]?\\w+)*@\\w+([\\.-]?\\w+)*(\\.\\w{2,3})+/
  {{{pattern}}} should be /\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+/

Description

While generating a typescript-axios client, pattern property gets improperly escaped, resulting in a non-valid regular expression. This seems to be caused by toRegularExpression(String pattern)method calling escapeText(String input): overriding the method for TypeScriptAxiosClientCodegen and removing escapeText() call fixes it (I'm raising a PR for this).

openapi-generator version

openapi-generator-cli 4.3.1-SNAPSHOT
commit : cb50ad5
built : 2020-04-17T20:52:08+02:00
source : https://github.com/openapitools/openapi-generator
docs : https://openapi-generator.tech/

OpenAPI declaration file content or url

Here's a minimal spec to reproduce the issue:

{
  "openapi": "3.0.1",
  "info": {
    "title": "[...]",
    "version": "1.0.0"
  },
  "paths": {
    "/account/register": {
      "post": {
        "tags": [
          "Account"
        ],
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/Register"
              }
            },
            "text/json": {
              "schema": {
                "$ref": "#/components/schemas/Register"
              }
            },
            "application/*+json": {
              "schema": {
                "$ref": "#/components/schemas/Register"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Success"
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "Register": {
        "required": [
          "Email",
          "Password"
        ],
        "type": "object",
        "properties": {
          "Email": {
            "pattern": "\\w+([\\.-]?\\w+)*@\\w+([\\.-]?\\w+)*(\\.\\w{2,3})+",
            "type": "string"
          },
          "Password": {
            "pattern": "(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[#$^+=!*()@%&]).{6,}",
            "type": "string"
          }
        }
      }
    }
  }
}

Command line used for generation

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -i <...> -g typescript-axios -o test/client -t ./

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