如何将文本转换为浮点数

# 使用 float() 函数将字符串转换为浮点数str_num = "3.14"float_num = float(str_num)print(float_num)  # 输出：3.14

// 使用 Double.parseDouble() 方法将字符串转换为浮点数String strNum = "3.14";double floatNum = Double.parseDouble(strNum);System.out.println(floatNum);  // 输出：3.14

import re# 使用正则表达式匹配浮点数str_num = "The value is 3.14"pattern = r"d+.d+"  # 匹配任意浮点数match = re.search(pattern, str_num)if match:    float_num = float(match.group())    print(float_num)  # 输出：3.14

import java.util.regex.Matcher;import java.util.regex.Pattern;// 使用正则表达式匹配浮点数String strNum = "The value is 3.14";Pattern pattern = Pattern.compile("d+.d+");  // 匹配任意浮点数Matcher matcher = pattern.matcher(strNum);if (matcher.find()) {    double floatNum = Double.parseDouble(matcher.group());    System.out.println(floatNum);  // 输出：3.14}