PREG_REPLACE如果字符串以char X結尾，則最後一個X字符將其替換爲Y字符

Question

如果字符串以character X結尾，我想用character Y替換該特定字符。

實施例1

anything_number_alphabet_dashes_anythingX[END OF STRING] 

到

anything_number_alphabet_dashes_anythingY[END OF STRING] 

實施例2

DontReplaceThis_X_JustOnlyThisLast_X[END OF STRING] 

到

DontReplaceThis_X_JustOnlyThisLast_Y[END OF STRING] 

我想用PHP做這個，用preg_replace或ereg_replace。

Answer 1

美元符號的字符串錨的結束，所以：

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