使用正则表达式验证wordpress字段

Question

我使用functions.php中的代码在注册表单中创建了一个新字段:

function wooc_extra_register_fields() {?>

<p class="form-row form-row-wide">
<label for="reg_billing_first_name"><?php _e( 'Bitcoin Refund Address', 'woocommerce' ); ?><span class="required">*</span></label>
<input type="text" class="input-text" name="billing_first_name" id="reg_billing_first_name" value="<?php if ( ! empty( $_POST['billing_first_name'] ) ) esc_attr_e( $_POST['billing_first_name'] ); ?>" />
</p>

<div class="clear"></div>
<?php
}
add_action( 'woocommerce_register_form_start', 'wooc_extra_register_fields' );

现在我需要用regex表达式验证该字段，如下所示:

^(bc1|[13])[a-zA-HJ-NP-Z0-9]{25,39}$

当前字段验证不能为空。如果有人能帮助我，我真的很感激。

function wooc_validate_extra_register_fields( $username, $email, $validation_errors ) {
if ( isset( $_POST['billing_first_name'] ) && empty( $_POST['billing_first_name'] ) ) {
$validation_errors->add( 'billing_first_name_error', __( 'Refund Address is required!', 'woocommerce' ) );
}

return $validation_errors;
}
add_action( 'woocommerce_register_post', 'wooc_validate_extra_register_fields', 10, 3 );

Answer 1

使用preg_match:

if ( preg_match( '/^(bc1|[13])[a-zA-HJ-NP-Z0-9]{25,39}$/', $_POST['billing_first_name'] ) ) {...}