export default (value = "") => {
  let error = null;
  const stripped = value.replace(/^[0-9a-zA-Z]*$/, "");

  if (stripped.length !== value.length) {
    error = "Input Contains Bad Characters";
  }

  return { error, value };
};

// This below code for varying the formats

import validator from "../../validators/alpha-numeric.js";

describe("Alphanumeric Only Validator For Input Validation", () => {
  test("Only Characters Passed", () => {
    expect(validator("Abcd")).toMatchObject({
      error: null,
      value: "Abcd"
    });
  });

  test("Alphanumeric Characters With Space", () => {
    expect(validator("Abc d")).toMatchObject({
      error: "Input Contains Bad Characters",
      value: "Abc d"
    });
  });

  test("Alphanumeric Characters With Numbers", () => {
    expect(validator("Ab123d")).toMatchObject({
      error: null,
      value: "Ab123D"
    });
  });

  test("Alphanumeric Characters With Special Characters", () => {
    expect(validator("Abcd@")).toMatchObject({
      error: "Input Contains Bad Characters",
      value: "Abcd@"
    });
  });
});

export default (value = "") => {
  let error = null;
  const stripped = value.replace(/^[0-9a-zA-Z]*$/, "");

  if (stripped.length !== value.length) {
    error = "Input Contains Bad Characters";
  }

  return { error, value };
};

// This below code for varying the formats

import validator from "../../validators/alpha-numeric.js";

describe("Alphanumeric Only Validator For Input Validation", () => {
  test("Only Characters Passed", () => {
    expect(validator("Abcd")).toMatchObject({
      error: null,
      value: "Abcd"
    });
  });

  test("Alphanumeric Characters With Space", () => {
    expect(validator("Abc d")).toMatchObject({
      error: "Input Contains Bad Characters",
      value: "Abc d"
    });
  });

  test("Alphanumeric Characters With Numbers", () => {
    expect(validator("Ab123d")).toMatchObject({
      error: null,
      value: "Ab123D"
    });
  });

  test("Alphanumeric Characters With Special Characters", () => {
    expect(validator("Abcd@")).toMatchObject({
      error: "Input Contains Bad Characters",
      value: "Abcd@"
    });
  });
});

This is full code i am using in React, please guide me the perfect result how can i verify alphanumeric.

This is the requirement even the below describe code i have written that is for unit testing, but if i am running "yarn unit-test" so i am getting error.

• javascript
• reactjs
• user-interface

Share Improve this question Follow asked Jan 10, 2019 at 10:50 Sanjay TiwariSanjay Tiwari 13311 gold badge22 silver badges99 bronze badges

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2 Answers 2

Sorted by: Reset to default 2

This:

const stripped = value.replace(/^[0-9a-zA-Z]*$/, "");

Only replaces those characters if they're the only ones in the string, because of the anchors (^ and $).

If you want to check value only contains those characters, there's no need to create another string:

if (/[^0-9a-zA-Z]/.test(value)) {
    // It has an invalid character
}

That works because the regular expression will match any character not in 0-9, a-z, or A-Z. If it doesn't match, there aren't any invalid characters.

Example:

function test(value) {
    if (/[^0-9a-zA-Z]/.test(value)) {
        console.log(JSON.stringify(value), "=> invalid");
    } else {
        console.log(JSON.stringify(value), "=> valid");
    }
}
test("");      // Valid
test("0a");    // Valid
test("Ab123d") // Valid
test("0a-");   // Invalid

Hello everyone i have got the solution of this question, please find the alphanumeric pattern /\w/. This pattern is working for me, also please find the steps for regex creation...enter link description here