@@ -0,0 +1,121 @@
+import React from 'react';
+import { Link } from 'react-router-dom';
+import { withRouter } from 'react-router';
+import './Login.scss';
+
+const REGEXP = {
+  emailRegExp:
+    /[a-zA-Z0-9.-_+!]+@[a-zA-Z0-9]+\.[a-zA-Z0-9]{2,}(?:.[a-zA-Z0-9]{2,3})?/,
+  passwordRegExp: /[a-zA-Z0-9]{5,100}/,
+};
+
+class Login extends React.Component {
+  constructor(props) {
+    super(props);
+
+    this.state = { userId: '', userPw: '' };
+  }
+
+  validate = (value, regExp) => {
+    const reg = new RegExp(regExp);
+    return reg.test(value);
+  };
+
+  validateInputData = (id, pw) => {
+    return (
+      this.validate(id, REGEXP.emailRegExp) &&
+      this.validate(pw, REGEXP.passwordRegExp)
+    );
+  };
+
+  handleInput = e => {
+    const { name, value } = e.target;
+    this.setState({
+      [name]: value,
+    });
+  };
+
+  handleSubmit = e => {
+    e.preventDefault();
+
+    const { userId, userPw } = this.state;
+    if (!this.validateInputData(userId, userPw)) return;
+
+    this.props.history.push('/main');
+  };
+
+  render() {
+    const { userId, userPw } = this.state;
+
+    return (
+      <>
+        <section className="entire-container">
+          <div className="entire">
+            <div className="entire_top content">
+              <div className="login_container">
+                <h1>westagram</h1>
+                <div className="form_container">
+                  <form onSubmit={this.handleSubmit}>
+                    <input
+                      type="text"
+                      name="userId"
+                      placeholder="전화번호, 사용자 이름 또는 이메일"
+                      value={userId}
+                      onChange={this.handleInput}
+                    />
+                    <input
+                      type="password"
+                      name="userPw"
+                      placeholder="비밀번호"
+                      value={userPw}
+                      onChange={this.handleInput}
+                    />
+                    <Link to="/main">
+                      <button
+                        className="login-button"
+                        type="submit"
+                        disabled={!this.validateInputData(userId, userPw)}
+                        onClick={this.handleSubmit}
+                      >
+                        로그인
+                      </button>
+                    </Link>
+                  </form>
+
+                  <div className="line_container">
+                    <div className="line"></div>
+                    <div className="line-word">또는</div>
+                    <div className="line"></div>
+                  </div>
+
+                  <button className="social-login-button">
+                    <img
+                      src="data:image/svg+xml;base64,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"
+                      alt="facebook button"
+                    />
+                    <span>Facebook으로 로그인</span>
+                  </button>
+                </div>
+
+                <Link to="/" className="search-password">
+                  비밀번호를 잊으셨나요?
+                </Link>
+              </div>
+            </div>
+
+            <div className="entire_bottom content">
+              <p>
+                계정이 없으신가요?&nbsp;
+                <a href="https://www.instagram.com/accounts/emailsignup/">
+                  가입하기
+                </a>
+              </p>
+            </div>
+          </div>
+        </section>
+      </>
+    );
+  }
+}
+
+export default withRouter(Login);

리뷰: validateInputData 를 호출하고 계시지만 이 함수는 실행되기만 하고 리턴값을 어디에도 활용하지 않고 있는 것 같습니다!
실질적으로 어떤 의미도 없는 코드같습니다!