[react-native] React Native add bold or italics to single words in <Text> field

you can use https://www.npmjs.com/package/react-native-parsed-text

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import ParsedText from 'react-native-parsed-text';_x000D_
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class Example extends React.Component {_x000D_
  static displayName = 'Example';_x000D_
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  handleUrlPress(url) {_x000D_
    LinkingIOS.openURL(url);_x000D_
  }_x000D_
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  handlePhonePress(phone) {_x000D_
    AlertIOS.alert(`${phone} has been pressed!`);_x000D_
  }_x000D_
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  handleNamePress(name) {_x000D_
    AlertIOS.alert(`Hello ${name}`);_x000D_
  }_x000D_
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  handleEmailPress(email) {_x000D_
    AlertIOS.alert(`send email to ${email}`);_x000D_
  }_x000D_
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  renderText(matchingString, matches) {_x000D_
    // matches => ["[@michel:5455345]", "@michel", "5455345"]_x000D_
    let pattern = /\[(@[^:]+):([^\]]+)\]/i;_x000D_
    let match = matchingString.match(pattern);_x000D_
    return `^^${match[1]}^^`;_x000D_
  }_x000D_
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  render() {_x000D_
    return (_x000D_
      <View style={styles.container}>_x000D_
        <ParsedText_x000D_
          style={styles.text}_x000D_
          parse={_x000D_
            [_x000D_
              {type: 'url',                       style: styles.url, onPress: this.handleUrlPress},_x000D_
              {type: 'phone',                     style: styles.phone, onPress: this.handlePhonePress},_x000D_
              {type: 'email',                     style: styles.email, onPress: this.handleEmailPress},_x000D_
              {pattern: /Bob|David/,              style: styles.name, onPress: this.handleNamePress},_x000D_
              {pattern: /\[(@[^:]+):([^\]]+)\]/i, style: styles.username, onPress: this.handleNamePress, renderText: this.renderText},_x000D_
              {pattern: /42/,                     style: styles.magicNumber},_x000D_
              {pattern: /#(\w+)/,                 style: styles.hashTag},_x000D_
            ]_x000D_
          }_x000D_
          childrenProps={{allowFontScaling: false}}_x000D_
        >_x000D_
          Hello this is an example of the ParsedText, links like http://www.google.com or http://www.facebook.com are clickable and phone number 444-555-6666 can call too._x000D_
          But you can also do more with this package, for example Bob will change style and David too. [email protected]_x000D_
          And the magic number is 42!_x000D_
          #react #react-native_x000D_
        </ParsedText>_x000D_
      </View>_x000D_
    );_x000D_
  }_x000D_
}_x000D_
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const styles = StyleSheet.create({_x000D_
  container: {_x000D_
    flex: 1,_x000D_
    justifyContent: 'center',_x000D_
    alignItems: 'center',_x000D_
    backgroundColor: '#F5FCFF',_x000D_
  },_x000D_
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  url: {_x000D_
    color: 'red',_x000D_
    textDecorationLine: 'underline',_x000D_
  },_x000D_
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  email: {_x000D_
    textDecorationLine: 'underline',_x000D_
  },_x000D_
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  text: {_x000D_
    color: 'black',_x000D_
    fontSize: 15,_x000D_
  },_x000D_
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  phone: {_x000D_
    color: 'blue',_x000D_
    textDecorationLine: 'underline',_x000D_
  },_x000D_
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  name: {_x000D_
    color: 'red',_x000D_
  },_x000D_
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  username: {_x000D_
    color: 'green',_x000D_
    fontWeight: 'bold'_x000D_
  },_x000D_
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  magicNumber: {_x000D_
    fontSize: 42,_x000D_
    color: 'pink',_x000D_
  },_x000D_
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  hashTag: {_x000D_
    fontStyle: 'italic',_x000D_
  },_x000D_
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});
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