I need to identify substring 'X.123' and/or 'X.8' in a longer string of alphanumeric data. Ex:
我需要在更长的字母数字数据字符串中识别子字符串'X.123'和/或'X.8'。例如:
A cow flew over the moon in the X.123 module, not the X.124.3 module,
and certainly not the X.125C78 module. The cow poo-pooed the X.8 module.
How would I exclude the second and third instance? This is what I've come up with so far to get the "X.123" part:
我如何排除第二和第三个实例?这是我到目前为止得到的“X.123”部分:
/[X][\.][0-9]{1,4}/
I'm not exactly sure how to make the expression stop at any non-numeric character (ex: X124C78)
我不确定如何使表达式停止在任何非数字字符处(例如:X124C78)
Help greatly appreciated!
非常感谢!
3 个解决方案
#1
4
The \b is nice in this context, i would use it like this:
\ b在这种情况下很好,我会像这样使用它:
/\bX\.\d{1,4}\b/
#2
2
Try this:
/X\.[0-9]{1,4}(?=\s|$)/
#3
1
I would use this. The \b in the start helps avoiding matches such as AX.123
我会用这个。开头的\ b有助于避免诸如AX.123之类的匹配
/\bX\.\d+(?=\s|$)/
preg_match_all('/\bX\.\d+(?=\s|$)/', $subject, $result, PREG_PATTERN_ORDER);
for ($i = 0; $i < count($result[0]); $i++) {
# Matched text = $result[0][$i];
}
#1
4
The \b is nice in this context, i would use it like this:
\ b在这种情况下很好,我会像这样使用它:
/\bX\.\d{1,4}\b/
#2
2
Try this:
/X\.[0-9]{1,4}(?=\s|$)/
#3
1
I would use this. The \b in the start helps avoiding matches such as AX.123
我会用这个。开头的\ b有助于避免诸如AX.123之类的匹配
/\bX\.\d+(?=\s|$)/
preg_match_all('/\bX\.\d+(?=\s|$)/', $subject, $result, PREG_PATTERN_ORDER);
for ($i = 0; $i < count($result[0]); $i++) {
# Matched text = $result[0][$i];
}