PREG_REPLACE如果字符串以char X结尾，则将最后一个X字符替换为Y字符

PREG_REPLACE if string ends with char X, then the last X character replace it with a Y character

如果字符串以character X结尾，我想用character Y替换该特定字符。

anything_number_alphabet_dashes_anythingX[END OF STRING]

anything_number_alphabet_dashes_anythingY[END OF STRING]

DontReplaceThis_X_JustOnlyThisLast_X[END OF STRING]

DontReplaceThis_X_JustOnlyThisLast_Y[END OF STRING]

我想在PHP中使用preg_replace或ereg_replace。

美元符号是字符串锚的结束符，所以:

$new_str = preg_replace('/X$/', 'Y', $old_str);